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Discussion Starter #1
i know we face tough regulations and maybe this is a stupid question ... (of
course) - a friend of mine is working at a factory that makes LED stage
lights and i am wondering the fesability of using them for headlights....
http://www.theonelights.com/ just want to know how far out i am on this. i
bought an led flashlight and strapped it onto the front of my e-bike ( man i
like that thing more everyday ... i never dreamed i would ) that works great
but i live in a place that is mostly well lit... anyway- i wanted to bounce
this off you guys,
thanks
rick
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Discussion Starter #2
Rick

The problem you'll face over here (US) is that everything has to be
"DOT approved." There are certainly cars coming out with LED
headlights, but that's a lot different than rolling your own.

Do you have any details of the LEDs they incorporate in their stage
lights? What wattage LEDs are they using? Lumens?

I've incorporated a few LED running lights in my car and would love to
do more. Maybe they'd make good driving lights, just not main
headlights.

Dave Cover

Rick Randazzo <[email protected]> wrote:
> i know we face tough regulations and maybe this is a stupid question ... =
(of
> course) - a friend of mine is working at a factory that makes LED s=
tage
> lights and i am wondering the fesability of using them for headlights....
> http://www.theonelights.com/ just want to know how far out i am on this. i
> bought an led flashlight and strapped it onto the front of my e-bike ( ma=
n i
> like that thing more everyday ... i never dreamed i would ) that works gr=
eat
> but i live in a place that is mostly well lit... anyway- i wanted to boun=
ce
> this off you guys,
> thanks
> rick
> -------------- next part --------------
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http://www.evalbum.com/2149

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Discussion Starter #3
Rick,
Regulations vary by state, and by vehicle type, for example in Florida,
Four wheeled or more motor vehicles must have headlamps compliant with
Federal DOT specifications, Motorcycles with 2 or 3 wheels meet a less
stringent requirement and low powered cycles only requirement is that the
red in the back and white light in the front must be plainly visible 500 ft
distant. so one usually sees bicycles with a flashlight clamped to the
handlebars. Personally I would try to find a front light with a Fresnel lens
for best visibility but the LED stage flood might work very well. Remember
the dual purpose of seeing the road ahead and being seen by approaching
drivers so they give you the space you deserve. A few extra reflectors can
add to the visibility by others and do not detract from style if placed
"Artistically" to follow vehicle lines. If licensed as a motorcycle follow
those rules, or as appropriate and if not excessive to a fault, multiple
accessory or "Clearance" lights just might save your life at night.
Regards,
Dennis Miles
--------------------------------------------------------------------------
Rick Randazzo <[email protected]> wrote:

> i know we face tough regulations and maybe this is a stupid question ...
> (of
> course) - a friend of mine is working at a factory that makes LED stage
> lights and i am wondering the fesability of using them for headlights....
> http://www.theonelights.com/ just want to know how far out i am on this. i
> bought an led flashlight and strapped it onto the front of my e-bike ( man
> i
> like that thing more everyday ... i never dreamed i would ) that works
> great
> but i live in a place that is mostly well lit... anyway- i wanted to bounce
> this off you guys,
> thanks
> rick
> -------------- next part --------------
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>



--
Regards,
*Dennis Lee Miles* (Director) *E.V.T.I. inc*.
*www.E-V-T-I-Inc.COM <http://www.e-v-t-i-inc.com/> *(Adviser)*
EVTI-EVAEducation Chapter
*
Phone (813) ID4 - E V T I or (813) 434 - 3884
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Discussion Starter #4
Here is a link for 7" round DOT approved LED headlights...

http://www.class8truckparts.com/TruckLite-7-Round-12v-LED-Headlamp/M/B002IFR
ROM.htm

They are about $300.00

Features :
DOT Approved, High Beam and Low Beam performance
Provides light output closer to the color temperature of daylight
Solid-state design resists damage from shock & vibration
50x longer life (10,000 hrs vs 400 hrs) than comparable incandescent lamps,
saving time and money
3-Year Limited Warranty

-----Original Message-----
From: [email protected] [mailto:[email protected]] On Behalf
Of Rick Randazzo
Sent: Thursday, December 09, 2010 5:55 AM
To: Electric Vehicle Discussion List
Subject: [EVDL] [EDVL] led stage lights for headlights ?

i know we face tough regulations and maybe this is a stupid question ... (of
course) - a friend of mine is working at a factory that makes LED stage
lights and i am wondering the fesability of using them for headlights....
http://www.theonelights.com/ just want to know how far out i am on this. i
bought an led flashlight and strapped it onto the front of my e-bike ( man i
like that thing more everyday ... i never dreamed i would ) that works great
but i live in a place that is mostly well lit... anyway- i wanted to bounce
this off you guys, thanks rick
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Discussion Starter #5
http://www.deseretnews.com/article/515033030/LED-buggy-lights-last-longer.html
talks about LED Head Lights for Horse Drawn Buggies........me

Dennis Miles <[email protected]> wrote:

> Rick,
> Regulations vary by state, and by vehicle type, for example in Florida,
> Four wheeled or more motor vehicles must have headlamps compliant with
> Federal DOT specifications, Motorcycles with 2 or 3 wheels meet a less
> stringent requirement and low powered cycles only requirement is that the
> red in the back and white light in the front must be plainly visible 500 ft
> distant. so one usually sees bicycles with a flashlight clamped to the
> handlebars. Personally I would try to find a front light with a Fresnel
> lens
> for best visibility but the LED stage flood might work very well. Remember
> the dual purpose of seeing the road ahead and being seen by approaching
> drivers so they give you the space you deserve. A few extra reflectors can
> add to the visibility by others and do not detract from style if placed
> "Artistically" to follow vehicle lines. If licensed as a motorcycle follow
> those rules, or as appropriate and if not excessive to a fault, multiple
> accessory or "Clearance" lights just might save your life at night.
> Regards,
> Dennis Miles
> --------------------------------------------------------------------------
> On Thu, Dec 9, 2010 at 7:55 AM, Rick Randazzo <[email protected]>
> wrote:
>
> > i know we face tough regulations and maybe this is a stupid question ...
> > (of
> > course) - a friend of mine is working at a factory that makes LED stage
> > lights and i am wondering the fesability of using them for headlights....
> > http://www.theonelights.com/ just want to know how far out i am on this.
> i
> > bought an led flashlight and strapped it onto the front of my e-bike (
> man
> > i
> > like that thing more everyday ... i never dreamed i would ) that works
> > great
> > but i live in a place that is mostly well lit... anyway- i wanted to
> bounce
> > this off you guys,
> > thanks
> > rick
> > -------------- next part --------------
> > An HTML attachment was scrubbed...
> > URL:
> >
> http://lists.sjsu.edu/mailman/private/ev/attachments/20101209/523091dd/attachment.html
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> > | REPLYING: address your message to [email protected] only.
> > | Multiple-address or CCed messages may be rejected.
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> > | OTHER HELP: http://evdl.org/help/
> > | OPTIONS: http://lists.sjsu.edu/mailman/listinfo/ev
> >
>
>
>
> --
> Regards,
> *Dennis Lee Miles* (Director) *E.V.T.I. inc*.
> *www.E-V-T-I-Inc.COM <http://www.e-v-t-i-inc.com/> <
> http://www.e-v-t-i-inc.com/> *(Adviser)*
> EVTI-EVAEducation Chapter
> *
> Phone (813) ID4 - E V T I or (813) 434 - 3884
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Discussion Starter #6
I went through the same debate with myself about LED headlights and decided
there was too much uncertainty about whether LEDs would really do the
job for that application. I also considered the DOT approval issue. My
goal was to reduce the amp draw on my accessory battery, so as a compromise
I put in Xenon lights which draw 35W rather than the usual 55W for Halogens;
they require some extra hardware so you can't just replace the bulbs, but I
decided it was worth the added expense. I've since discovered tthe added
benefit that they seem to give me better down the road vision than the
previous Halogen lights.

Am now looking into LEDs for all the other lights (turn signals, brakes,
etc.)

- Peter Flipsen Jr
http://www.evalbum.com/1974

>
> --------------------------------------------------------------------------
> > On Thu, Dec 9, 2010 at 7:55 AM, Rick Randazzo <[email protected]>
> > wrote:
> >
> > > i know we face tough regulations and maybe this is a stupid question
> ...
> > > (of
> > > course) - a friend of mine is working at a factory that makes LED
> stage
> > > lights and i am wondering the fesability of using them for
> headlights....
> > > http://www.theonelights.com/ just want to know how far out i am on
> this.
> > i
> > > bought an led flashlight and strapped it onto the front of my e-bike (
> > man
> > > i
> > > like that thing more everyday ... i never dreamed i would ) that works
> > > great
> > > but i live in a place that is mostly well lit... anyway- i wanted to
> > bounce
> > > this off you guys,
> > > thanks
> > > rick
>
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Discussion Starter #7
Yes, do not forget this. We did a car with all LED bulbs for turn signals
and brake lights and then stood around like idiots when the turn signals
would not blink. Whoops! The lousy part is that solid state relay boxes that
can handle LED bulbs are more money than older, traditional turn signal
relays. You can be cheap by switching either the front or rear bulbs to LED
and leave the others as incandescent bulbs. This is usually enough to make
the old style relays work properly.

Peter C. Thompson <[email protected]>wrote:

> Hi Pete,
>
> When replacing the turn signals, you will also (most likely) need to
> replace the blinker relay. Most relays for cars use the current to
> drive the amount of time a turn light is on...and since the LEDs draw
> significantly less current, it can be a problem. There are several
> replacement relays on the market though, so you should have no trouble
> finding them.
>
> Cheers,
> Peter
>
> On 12/9/2010 9:38 AM, SLPinfo.org wrote:
> > I went through the same debate with myself about LED headlights and
> decided
> > there was too much uncertainty about whether LEDs would really do the
> > job for that application. I also considered the DOT approval issue. My
> > goal was to reduce the amp draw on my accessory battery, so as a
> compromise
> > I put in Xenon lights which draw 35W rather than the usual 55W for
> Halogens;
> > they require some extra hardware so you can't just replace the bulbs, but
> I
> > decided it was worth the added expense. I've since discovered tthe added
> > benefit that they seem to give me better down the road vision than the
> > previous Halogen lights.
> >
> > Am now looking into LEDs for all the other lights (turn signals, brakes,
> > etc.)
> >
> > - Peter Flipsen Jr
> > http://www.evalbum.com/1974
> >
> > >
> >>
> --------------------------------------------------------------------------
> >>> On Thu, Dec 9, 2010 at 7:55 AM, Rick Randazzo<[email protected]>
> >>> wrote:
> >>>
> >>>> i know we face tough regulations and maybe this is a stupid question
> >> ...
> >>>> (of
> >>>> course) - a friend of mine is working at a factory that makes LED
> >> stage
> >>>> lights and i am wondering the fesability of using them for
> >> headlights....
> >>>> http://www.theonelights.com/ just want to know how far out i am on
> >> this.
> >>> i
> >>>> bought an led flashlight and strapped it onto the front of my e-bike (
> >>> man
> >>>> i
> >>>> like that thing more everyday ... i never dreamed i would ) that works
> >>>> great
> >>>> but i live in a place that is mostly well lit... anyway- i wanted to
> >>> bounce
> >>>> this off you guys,
> >>>> thanks
> >>>> rick
> > -------------- next part --------------
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> > | Multiple-address or CCed messages may be rejected.
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> >
>
>
> --
> ------------------------------------------------------------------------
> *Peter C. Thompson*
> *Qualcomm, Incorporated.* Office: +1 (858) 658-1936 Mobile: +1
> (858) 692-3571
> AIM: PThompson509 Yahoo!:peter_thompson MSN:
> [email protected] Skype: PThompson509
>
> _______________________________________________
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>
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Discussion Starter #8
My concern is that (AFAIK) white LEDs still use a phosphor, and its output
declines over time. Incandescent headlamps dim too, but not nearly as much.

Getting the heat out of high power LED has always been a problem, too. That
suggests to me that their efficiency isn't as great as some people think.
In fact, the really high efficacy LEDs are just now beginning to make their
way out of the lab. Last I saw (generically at least), HID still beat them
hands down.

This may change in a few years, but right now for high efficiency EV
headlights, I don't think you're going to beat HID. But I could be wrong.

David Roden - Akron, Ohio, USA
EVDL Administrator

= = = = = = = = = = = = = = = = = = = = = = = = = = = = =
EVDL Information: http://www.evdl.org/help/
= = = = = = = = = = = = = = = = = = = = = = = = = = = = =
Note: mail sent to "evpost" and "etpost" addresses will not
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Discussion Starter #9
Hi,

I replaced almost all the turn signal, brake light, and marker lights on our cars with LED's and SuperBright LED's had a replacement flashing relay for about $12 or $14.

I had tried to modify the stock unit, but it was not consistent, so the replacement unit was good to have.

In addition to the 7" "truck" LED headlights mentioned earlier (that the Illuminati Seven used, by the way), I have seen LED projector style headlights, as well.

http://www.class8truckparts.com/TruckLite-7-Round-12v-LED-Headlamp/M/B002IFRROM.htm
http://tinyurl.com/2arbkjz

> Yes, do not forget this. We did a car with all LED bulbs for turn signals
> and brake lights and then stood around like idiots when the turn signals
> would not blink. Whoops! The lousy part is that solid state relay boxes that
> can handle LED bulbs are more money than older, traditional turn signal
> relays. You can be cheap by switching either the front or rear bulbs to LED
> and leave the others as incandescent bulbs. This is usually enough to make
> the old style relays work properly.
>
>> When replacing the turn signals, you will also (most likely) need to
>> replace the blinker relay. Most relays for cars use the current to
>> drive the amount of time a turn light is on...and since the LEDs draw
>> significantly less current, it can be a problem. There are several
>> replacement relays on the market though, so you should have no trouble
>> finding them.

Sincerely, Neil
http://neilblanchard.blogspot.com/


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Discussion Starter #10
One of the significant advantages of eBikes is that they are NOT regulated =
by DOT, but by the Consumer Product Safety Commission -- so you can be a lo=
t more creative "rolling your own". You could put homemade LED headlights =
on THIS EV, no problem.

In Illinois, eBikes can be 3-wheeled, all-enclosed but have a maximum unass=
isted by pedaling speed of 20 mph if you weigh 175 pounds (if you're UNDER =
or OVER 175 pounds, there is no restriction, but if there's 175 pounds on t=
he seat, you can only go 20 mph). If you're pedaling, the top-end speed is=
not limited. 750 watt motor maximum, no restrictions on how MANY 750 watt=
motors ;-) Of course I'm not a lawyer and this is my bendy interpretatio=
n of the law on the books. It's pretty poorly written.

No insurance, plate/registration or driver's license required. Just gotta =
be 16 and you can't drive it on the sidewalk. 20mph is *fast* on a regular=
bicycle.

-----Original Message-----
From: [email protected] [mailto:[email protected]] On Behal=
f Of dave cover
Sent: Thursday, December 09, 2010 9:55 AM
To: Electric Vehicle Discussion List
Subject: Re: [EVDL] [EDVL] led stage lights for headlights ?

Rick

The problem you'll face over here (US) is that everything has to be
"DOT approved." There are certainly cars coming out with LED
headlights, but that's a lot different than rolling your own.

Do you have any details of the LEDs they incorporate in their stage
lights? What wattage LEDs are they using? Lumens?

I've incorporated a few LED running lights in my car and would love to
do more. Maybe they'd make good driving lights, just not main
headlights.

Dave Cover

Rick Randazzo <[email protected]> wrote:
> i know we face tough regulations and maybe this is a stupid question ... =
(of
> course) - a friend of mine is working at a factory that makes LED s=
tage
> lights and i am wondering the fesability of using them for headlights....
> http://www.theonelights.com/ just want to know how far out i am on this. i
> bought an led flashlight and strapped it onto the front of my e-bike ( ma=
n i
> like that thing more everyday ... i never dreamed i would ) that works gr=
eat
> but i live in a place that is mostly well lit... anyway- i wanted to boun=
ce
> this off you guys,
> thanks
> rick
> -------------- next part --------------
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-- =

http://www.evalbum.com/2149

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Discussion Starter #11
Thanks I was aware of the need for electronic flashers when switching to led bulbs. Several of the websites selling LEDs have some pretty good info about making the switch. They've probably had to deal with returns from people expecting simple plug and play.

Peter

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Discussion Starter #12
Good info and advise as always Lee. I'm one who prefers the simpler approaches and it sounds like just using LED bulbs and electronic flashers for all but the headlights (where the Xenon bulbs are working) will do it for me.

Peter

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Discussion Starter #13
I bought an X21 LED flashlight (brand name LED Lenser, 21.5W, 1050 lumens)
to experiment with. This produces more light than a normal car head lamp &
has a an adjustable beam & two intensity settings. It is powered by 4 D
cells so would be possible to fit in place of a head lamp & run two in
series from a 12V system. One setting could be low beam, the other high
beam. You could manually adjust the focus to suit driving conditions. I may
use two of these next year when Ill be driving my EV from Melbourne to
Brisbane where there will be some night driving in order to make some
progress. Im going to attach them to the bonnet using suction caps and
mounting frame. The claimed 300 hr per set of cells suggests that you may as
well use the throw away cells or use NiCds or NiMH. When driving ill
probably set them up as somewhat higher low beam lights & retain the normal
head lamps to use high beam as needed. At $500 each they are too expensive
to leave permanently on the car. David

--------------------------------------------------
From: "Rick Randazzo" <[email protected]>
Sent: Thursday, December 09, 2010 11:55 PM
To: "Electric Vehicle Discussion List" <[email protected]>
Subject: [EVDL] [EDVL] led stage lights for headlights ?

> i know we face tough regulations and maybe this is a stupid question ...
> (of
> course) - a friend of mine is working at a factory that makes LED stage
> lights and i am wondering the fesability of using them for headlights....
> http://www.theonelights.com/ just want to know how far out i am on this. i
> bought an led flashlight and strapped it onto the front of my e-bike ( man
> i
> like that thing more everyday ... i never dreamed i would ) that works
> great
> but i live in a place that is mostly well lit... anyway- i wanted to
> bounce
> this off you guys,
> thanks
> rick
> -------------- next part --------------
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Discussion Starter #14
On 10 Dec 2010 at 9:12, David Sharpe wrote:

> It is powered by 4 D cells so would be possible to fit in place of a
> head lamp & run two in series from a 12V system.

Many (most?) good-quality LED flashlights have buck/boost voltage regulators
in them to maintain a consistent voltage and brightness. I'm not an EE so
I'm a little hazy on the details, but I'd be concerned that the input
current is apt to vary. If that be true, I'm not so sure that the
flashlights' circuits would take kindly to being run in series across a
battery. You might have to buy or devise a 12v:6v DC:DC to power them.

Regardless, it would be an interesting experiment.

David Roden
EVDL Administrator
http://www.evdl.org/


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Discussion Starter #15
As for me Ill just run the internal cells.
D

--------------------------------------------------
From: "EVDL Administrator" <[email protected]>
Sent: Friday, December 10, 2010 6:03 PM
To: "Electric Vehicle Discussion List" <[email protected]>
Subject: Re: [EVDL] [EDVL] led stage lights for headlights ?

> On 10 Dec 2010 at 9:12, David Sharpe wrote:
>
>> It is powered by 4 D cells so would be possible to fit in place of a
>> head lamp & run two in series from a 12V system.
>
> Many (most?) good-quality LED flashlights have buck/boost voltage
> regulators
> in them to maintain a consistent voltage and brightness. I'm not an EE so
> I'm a little hazy on the details, but I'd be concerned that the input
> current is apt to vary. If that be true, I'm not so sure that the
> flashlights' circuits would take kindly to being run in series across a
> battery. You might have to buy or devise a 12v:6v DC:DC to power them.
>
> Regardless, it would be an interesting experiment.
>
> David Roden
> EVDL Administrator
> http://www.evdl.org/
>
>
> _______________________________________________
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Discussion Starter #16
Guys,

Sorry, I know lots of folk poo-poo the benefits of LED lights as a
replacement for filament on a power savings basis. Whilst I think
having HID headlamps and LED front/rear position lights may be worth
it, indicators are definitely not - especially if you are going to
have to pay AND fiddle around changing the flasher relay! How much do
you use your indicators? On an average half hour drive you probably
only use a hundredth of a kWh of energy even with the filament bulbs.

Just not worth the candle.

Regards, Martin Winlow
Herts, UK
http://www.evalbum.com/2092
www.winlow.co.uk

Peter C. Thompson wrote:

> Hi Pete,
>
> When replacing the turn signals, you will also (most likely) need to
> replace the blinker relay. Most relays for cars use the current to
> drive the amount of time a turn light is on...and since the LEDs draw
> significantly less current, it can be a problem. There are several
> replacement relays on the market though, so you should have no trouble
> finding them.
>
> Cheers,
> Peter
>
> On 12/9/2010 9:38 AM, SLPinfo.org wrote:
>> I went through the same debate with myself about LED headlights and
>> decided
>> there was too much uncertainty about whether LEDs would really do the
>> job for that application. I also considered the DOT approval
>> issue. My
>> goal was to reduce the amp draw on my accessory battery, so as a
>> compromise
>> I put in Xenon lights which draw 35W rather than the usual 55W for
>> Halogens;
>> they require some extra hardware so you can't just replace the
>> bulbs, but I
>> decided it was worth the added expense. I've since discovered tthe
>> added
>> benefit that they seem to give me better down the road vision than
>> the
>> previous Halogen lights.
>>
>> Am now looking into LEDs for all the other lights (turn signals,
>> brakes,
>> etc.)
>>
>> - Peter Flipsen Jr
>> http://www.evalbum.com/1974
>>
>>>
>>> --------------------------------------------------------------------------
>>>> On Thu, Dec 9, 2010 at 7:55 AM, Rick Randazzo<[email protected]x>
>>>> wrote:
>>>>
>>>>> i know we face tough regulations and maybe this is a stupid
>>>>> question
>>> ...
>>>>> (of
>>>>> course) - a friend of mine is working at a factory that makes
>>>>> LED
>>> stage
>>>>> lights and i am wondering the fesability of using them for
>>> headlights....
>>>>> http://www.theonelights.com/ just want to know how far out i am on
>>> this.
>>>> i
>>>>> bought an led flashlight and strapped it onto the front of my e-
>>>>> bike (
>>>> man
>>>>> i
>>>>> like that thing more everyday ... i never dreamed i would ) that
>>>>> works
>>>>> great
>>>>> but i live in a place that is mostly well lit... anyway- i
>>>>> wanted to
>>>> bounce
>>>>> this off you guys,
>>>>> thanks
>>>>> rick
>> -------------- next part --------------
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>
>
> --
> ------------------------------------------------------------------------
> *Peter C. Thompson*
> *Qualcomm, Incorporated.* Office: +1 (858) 658-1936 Mobile: +1
> (858) 692-3571
> AIM: PThompson509 Yahoo!:peter_thompson MSN:
> [email protected] Skype: PThompson509
>
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Discussion Starter #17
EVDL Administrator wrote:

> ... My concern is that (AFAIK) white LEDs still use a phosphor, and
> its output
> declines over time. Incandescent headlamps dim too, but not nearly
> as much.
> ...
> David Roden - Akron, Ohio, USA
> EVDL Administrator


Ahhh! That'll be why my rear lights appear to continue to glow faintly
after they're switched off! I thought I was seeing things.

Regards, Martin Winlow
Herts, UK
http://www.evalbum.com/2092
www.winlow.co.uk

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Discussion Starter #18
Martin WINLOW wrote:
> Whilst I think having HID headlamps and LED front/rear position lights may be worth
> it, indicators are definitely not - especially if you are going to
> have to pay AND fiddle around changing the flasher relay! On an average half hour drive you probably
> only use a hundredth of a kWh of energy even with the filament bulbs.

The turn signal indicators are usually the same bulbs used for brake and
tail lights. If you replace your tail and brake light bulbs with LEDs,
you'll *have* to replace the flasher as well.

You make a good point that the energy savings is tiny. Besides the
headlights, a car might have 5 amps worth of lights on at night. 5a at
14v is 70 watts. If you drive for an hour, that's only 70 watthours out
of a propulsion pack that is probably 10 KWH or more (less than 1%).

If you're designing an EV from scratch, there are some other
compensating benefits of LEDs. The lower current allows smaller wiring
and switches, a lower output DC/DC converter, and the light fixtures
themselves can be smaller and lighter. Feathers on the scale; but every
little bit helps!

--
Lee A. Hart | Ring the bells that still can ring
814 8th Ave N | Forget the perfect offering
Sartell MN 56377 | There is a crack in everything
leeahart earthlink.net | That's how the light gets in -- Leonard Cohen

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Discussion Starter #19
If you're looking for some low cost LED lights just to experiment with, you
could try this,

http://volumerate.com/products.vr/just.released

or here,
http://www.dealextreme.com/products.dx/category.999


----- Original Message ----
From: David Sharpe <[email protected]>
To: Electric Vehicle Discussion List <[email protected]>
Sent: Thu, December 9, 2010 5:12:13 PM
Subject: Re: [EVDL] [EDVL] led stage lights for headlights ?

I bought an X21 LED flashlight (brand name LED Lenser, 21.5W, 1050 lumens)
to experiment with. This produces more light than a normal car head lamp &
has a an adjustable beam & two intensity settings. It is powered by 4 D
cells so would be possible to fit in place of a head lamp & run two in
series from a 12V system. One setting could be low beam, the other high
beam. You could manually adjust the focus to suit driving conditions. I may
use two of these next year when Ill be driving my EV from Melbourne to
Brisbane where there will be some night driving in order to make some
progress. Im going to attach them to the bonnet using suction caps and
mounting frame. The claimed 300 hr per set of cells suggests that you may as
well use the throw away cells or use NiCds or NiMH. When driving ill
probably set them up as somewhat higher low beam lights & retain the normal
head lamps to use high beam as needed. At $500 each they are too expensive
to leave permanently on the car. David

--------------------------------------------------
From: "Rick Randazzo" <[email protected]>
Sent: Thursday, December 09, 2010 11:55 PM
To: "Electric Vehicle Discussion List" <[email protected]>
Subject: [EVDL] [EDVL] led stage lights for headlights ?

> i know we face tough regulations and maybe this is a stupid question ...
> (of
> course) - a friend of mine is working at a factory that makes LED stage
> lights and i am wondering the fesability of using them for headlights....
> http://www.theonelights.com/ just want to know how far out i am on this. i
> bought an led flashlight and strapped it onto the front of my e-bike ( man
> i
> like that thing more everyday ... i never dreamed i would ) that works
> great
> but i live in a place that is mostly well lit... anyway- i wanted to
> bounce
> this off you guys,
> thanks
> rick
> -------------- next part --------------
> An HTML attachment was scrubbed...
> URL:
>http://lists.sjsu.edu/mailman/private/ev/attachments/20101209/523091dd/attachment.html
>l
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Discussion Starter #20
On 10 Dec 2010 at 11:24, Martin WINLOW wrote:

> > ... white LEDs still use a phosphor...
>
> Ahhh! That'll be why my rear lights appear to continue to glow faintly
> after they're switched off! I thought I was seeing things.

Maybe. It could also be a bit of leakage current. Or the retrofits might
have a little power supply in them, with some capacitors. I've heard of the
same phenomenon with LED retrofits used in home light sockets. Gives some
folks the willies, I guess. ;-)

If they're red or amber LEDs, they don't use any kind of phosphor. Only
white LEDs use a phosphor. The LED itself actually produces blue light with
a strong UV component, and the phosphor is presumably akin to that used in
fluorescent lamps.

David Roden - Akron, Ohio, USA
EVDL Administrator

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