so many on the forums are fitting leds in the car wether it be headlight tail lights or dash ive put this info on so you understand that its not always as easy as it sounds hopefully it helps.
[b]Which Color LEDs should I use?[/b]
For best results the LED color should be the same as the lens color. As an example: a red lens will filter out all but the red portion of the light so if the light is all red, none or very little light will be blocked by the lens. The light from a White LED contains very little light in the red portion of the visible spectrum so most of the light would be filtered out by a red lens
[b]Dash indicators reporting burnt out bulbs[/b]
LED bulbs may cause some newer vehicles to indicate a bulb is burnt out (because of their low power consumption). Some cars indicate this by increasing the flash rate of the turn signals, some turn on a bad bulb indicator. The only fix for this is to install Load Resistors across the bulbs that are being indicated as bad. Some vehicles will also disable the cruise control system if a brake light bulb is being indicated as bad, the installation of Load Resistors will also solve this problem
[b]Brightness of LED Car Bulbs[/b]
LED bulbs are generally not as bright as standard incandescent bulbs, they have many advantages over filament bulbs (longer life, faster on/off times, lower power consumption, more vivid colors) but brightness is not one of them. They are generally not as bright but some of them with large numbers of LEDs, will appear brighter than filament bulbs. As an exception, our new 3 Watt and 5 Watt Luxeon LED car bulbs are as bright or brighter than most standard filament car bulbs. The light is distributed differently so they can appear brighter in some applications and not as bright in others, it depends on the size and shape of the bulb housing and reflector.
Most LED bulbs emit light like a flashlight, all out the end. Regular filament bulbs emit light from the end and all sides, so they will be better suited for some lighting applications than LED bulbs. This is the same reason why we do not rate LED car bulbs in lumens or watts, the numbers would be deceptively low because the light is measured from all sides and the end on standard filament bulbs but only from the end on LED bulbs
Do not use LED bulbs in the same housing with head lamps, the heat will cause them to fail quickly and void the warranty. We warrant all of our bulbs for one full year when if used in normal vehicle applications. We do not warrant our car bulbs when used in applications other than normal vehicle bulb installations or if used in headlamp housings or to replace GM Daytime Running Lights
Some GM vehicles apply a pulsed voltage to the Daytime Running Lights (DRL), this pulsed voltage causes LED bulbs to fail quickly, just as the stock filament bulbs also fail quickly in these DRL installations. Use in these applications voids the warranty