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Technical LED Question

 
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Old 05-12-2011, 11:14 PM
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Technical LED Question

Hey guys,
Sorry if this has been covered before, but I couldn't find a thread on it, other than bulb size etc.

I've noticed that my reverse lights just don't seem to be all that bright, so I've decided I'd like to swap them out with LED's..... and while I'm at it I think I'll just swap out all the bulbs in the tail lights for LEDs....

My one concern is that, whilst on at night, if I press on the brake will it become brighter? or stay the same?
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Old 05-13-2011, 06:09 AM
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Re: Technical LED Question

the luminosity will not change but the appearance of it will. you are going to be very dissapointed with how dim the leds are. barely see em in the day.

Last edited by Drjless; 05-13-2011 at 06:54 PM.
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Old 05-13-2011, 06:33 PM
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Re: Technical LED Question

Pre-fabbed LED's are designed to be dual intensity for your brake lights. I would make sure you go with a multi angle White SMD (surface Mount Design) type as these tend to be brighter thus negating the cautionary tale above me.

As for the Backup lights, you can build your own or again use a a multi-angle SMD and take advantage of the reflector already built into your reverse light assembly.

Start at LED Lights & Accessories - SUPER BRIGHT LEDS and become familiar with what is out there and the terminology. This will help you make an informed decision based on more than opinions.
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Old 05-13-2011, 08:55 PM
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Re: Technical LED Question

So would Double/Single filament not make a difference?
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Old 05-13-2011, 10:55 PM
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Re: Technical LED Question

LED's are not double or single filament.. you need to go beyond your analog thinking.

In terms of luminosity, like in a brake light, there are two ways to give the appearance of dim and bright. The simplest method is by varying the resistance which in turns limits the voltage to the Light Emitting Diode. Simple? Indeed. But any time you limit current through resistance the "waste" is heat. And we all know heat in electronics is the root of electronic demise.

The other way is called Pulse Width Modulation. This is done through simple circuitry. You appear to see dual luminosity through the "speed" of the LED flashing on and off. It happens so fast that your eye does not perceive the flashing... kind of. Ever look at the taillights on a Cadillac and turn away and you get that weird flash/fade? or you look left and right really fast with the taillight being the center focus?... That is your peripheral vision picking up on the pulse.


Lastly, what I was trying to describe is a "light" base that has multiple rows of SMD LED's.
Go to the web site I told you to go to earlier:
Go to this link as a matter of fact: Super Bright LEDs - Brake Light, Turn Light and Tail Light Bulbs
and scroll down to the 1157 Dual & 1156 Single Contact BA15 High Power SMD LED Automotive Bulbs
The picture of the "bulbs" is Exactly what I am talking about.
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