Third brake lights are a nice idea if you like the look of the addition. However, I would caution that replacing your other lights with LEDs may not be such a bright idea.
A little while back I found that my brake switch had stuck on and the MR16 high-intensity 20W lights I installed behind my original plastic reflector lenses had started to melt. Since I do like the added illumination of having lights behind the reflectors, I searched for a cooler alternative light sources and focused on LEDs. As a result of my research and experimentation, hear is some of what I have learned:
1. The choice of 1156 and 1157 LED replacements is quite broad and, although many state equal or greater illumination to 115X incandescent, very few meet that commitment.
2. Contrary to common incandescent practice, the LED chosen must be the same color as the lens or a large portion if its light output will be filtered out.
3. LEDs do generate heat at its base rather than at the bulb and high output units require a heat sink that, if not built into the bulb, must be added.
4. LEDs are sensitive to current deviations where incandescent are sensitive to voltage. A separate current control must be installed if not incorporated in the bulb’s design.
5. Although the benefit of an LED is its low amperage draw, if used with a flasher, either a large resistor must be installed with each light (greatly eliminating that benefit) or an electronic flasher must be substituted for your original.
6. Common LED replacements incorporate two types of LEDs (Surface Mount a Bulb) with SMDs potentially providing greater lumens per source.
7. If installed correctly, LED longevity is greater than incandescent, however when considering the time/use we put our LBCs through, either lighting source should last for many many years.
8. Good 115X LED replacements are not inexpensive and $25/bulb is today’s reasonable price.
I did install relatively inexpensive LEDs behind my reflectors that were stated to be much brighter than 1156s by their manufacturer. My satisfaction with these lights is marginal at best and this experience has convinced me to put off further LED lighting conversions until a reasonably priced total solution can be found.
Good luck,
Ray (64BJ8P1 Healey)
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