Has anyone had any success in finding a well-designed 1157-style brake/tail light bulb for vehicles? A brake light bulb must be able to operate in a normal low/taillight mode and then brighten when the brakes are pressed. My hunting online shows that there are many 1157-style LED bulbs available, but reviews typically indicate that there is little to no brightness change when the brakes are pressed. This poses a SEVERE safety hazard, in that following drivers will not be able to see the change and prepare to slow. The only exception I have found to date is DX's sku.193381 which is stated to have a very pronounced difference between high and low:
http://dx.com/p/wl20130104266-1157-12w-550-650lm-635-700nm-4-cree-xp-e-red-car-brake-light-193381
...although at $15/each.
I am attempting to upgrade the (very cheap) factory lighting on my motor scooter in an attempt to increase visibility beyond reason. I have a friend who was nearly killed when he was rear-ended on his bike after the driver behind him failed to notice his brake lights and turn signal. I would like to avoid this scenario if possible. When I hit my brakes, I want drivers behind me to have no excuse...
I have replaced the turn signals and driving lights with LEDs easily, but the dual-brightness taillight bulbs are a bigger challenge. I can replace the lights with brighter incandescent bulbs but would like to go the LED route if there is an off-the-shelf solution available.
A second bit of reasoning here is that the electrical system on my bike is a bit weak, and every watt that is saved by using a more efficient lighting method is that much more available to keep the battery charged. Safety, however, is my primary concern.