Hi Monty , can you post a review of the led performance (i.e. are they noticeably brighter than the standard 1156 or is the current draw and life the prime reason for switching ) Happy holidays John
A factor to consider is the reflector "dish" behind the bulb and the fresnel design of the lens. Also the bulb's proximity to the reflector, its shape and condition. You'll also note on the SuperBrights web catalog that they offer a wide variety of bulbs with a multitude of LED positions and LED count. Can get rather confusing.
I tried an LED brake light bulb on the R65 but it didn't seem as bright as the stock 1156. However, I did "cheap out" and buy an LED bulb with very few diodes. The reflector in the brake light section wasn't conductive to the smaller LED bulb. The turn signal reflectors are much closer and tighter to the bulb and offer better reflections.
For me, it boils down to experimentation. SuperBright will accept returns and exchanges for upgrades.
My wife's Cadillac DTS has extremely brilliant LED lamps -
multiple LEDs in the tail lights- but I can't get inside the unit to see the plastic lens design or any other details that might help with bulb selection for the Airheads.
For now, I buy the bulb with the widest angle and the greatest number of LEDs that will fit... without breaking the bank.