Diode Dynamics DD0022TW HP3 Pure White BulbsDesign. The 194 HP3 LED bulb is a compact, simple LED replacement with proven performance. The single diffused optic spreads light in the original lamp, for OEM style appearance and function. With its dual lead contacts, it will fit snugly in the socket, and its light weight means it won't vibrate loose over time. Reliability. Unlike other bulbs on the market, this bulb is built with constant current circuitry, along with transient suppression. That