Diode Dynamics DD0030TW HP5 Red BulbsDesign. The 194 HP5 LED bulb is a high power LED in a small package. With copper inserts for heat dissipation, the total output far exceeds the original bulb, with a single diffused optic to spread light evenly.. With its dual lead contacts, it will fit snugly in the socket as a direct plug and play replacement. Reliability. Unlike other bulbs on the market, this bulb is built with constant current circuitry, along with transient suppression. That