Features Direct replacement for factory incandescent 3156/3157-size turn signal bulb. Four COB type LED with a single high-power chip mounted at the top. Full metal heatsinking for reliable operation. Nonpolar and CK compatible electrical design. Increased output with LED appearance. Plug and play simple installation. 310 lumens per bulb. Overview Upgrade. Add more light output and a modern appearance to your vehicle with the 3156/3157 HP11 turn signal bulb. Populated with four side-firing 1.5W LED chips and one 5W LED chip with a projector lens on top the HP11. Housed in an aluminum casing for maximum heatsinking properties the HP11 will last for years to come. Best of all installation only takes minutes - simply take out your factory bulb and the HP11 will fit snugly in the socket. Brightness. At 310 lumens the HP11 will provide more total light output than your factory bulb. All Diode Dynamics LED lighting is rated with accurate measured lumen figures not calculations or guesses. We test the true output in-house and provide you the real numbers to compare. Reliability. Unlike other bulbs on the market this bulb is built with constant-current circuitry along with transient suppression. That means this bulb will last for years not months with no flickering or failure. And like every Diode Dynamics product it's backed by an industry-leading three-year replacement warranty.