Thanks, Chev...those folks had some interesting notes at the auto/bike bulb page:
--For best results the LED color should be the same as the lens color. 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. (Not sure I really agree with this statement! Under those red lenses are stock white bulbs, and they DO emit light!)
--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.This can be remedied with our Load Resistors wired across the turn signal bulbs to simulate a filament bulb load. We have these available by our LED turn signal bulbs in our online shopping cart
--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.
The light is distributed differently so they can appear brighter in some applications. (Well, yeah, one LED is not so bright, but when grouped together, as they usually are, they can be VERY bright.)
--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 that LED bulbs. (Never thought about this, but yeah, that's true, a license plate light or headlight would not be a good application for an LED.)