This RED LED can be used as a Tail Light, Brake Light, Running Light or Turn Signal and features an 1157 Dual Contact Style Socket/Bulb for 12 Volt Systems 19-LED Cluster (Light Emitting Diode) bulbs are the logical choice for any motorcycle build as they are not affected by vibrations and are known for their long lifespan and extremely high output. Most LED bulbs of this size produce 3500 MCD (mini candle power), but these bulbs produce 7000 MCD. SOLD INDIVIDUALLY: Total Length 1-1/2" & OD is 1" Note: These bulbs are not DOT approved and should be used accordingly Installation Note: Due to the lower amp draw of these LED bulbs, a load equalizer may be required for the turn signal function.