Lighting Source > LED Corn Light       BLxNB-x45A Feature: Replacement for CFL with E27 or E40 screwed lamp socket directly. Fast turn-on, no warm-up or cold start problems. Special surface design with arc, make sure radiation diameter on ground is accord with standards for size. Longer lifespan than HPS or other HID lamps. No ultraviolet (UV), does not attract insects. Solves 4 difficulties for LED packing, heat sink, operational lifespan and luminous efficiency.