This high output 50 watt halogen, single filament incandescent bulb is much brighter than standard 21 watt light bulbs.
#1156 automotive bulbs are commonly used in parking lights, cornering lights, turn signals and reverse/back-up lamps.
T4 Bulb DC Bayonet Base BA15S 12 Volt 50 Watt
Fits: GM (all 12 volt 1950's-1980's)