This energy efficient 8W LED 2D 4 pin bulb is designed to replace traditional 16W fluorescent bulbs, offering the same level of brightness, but using significantly less power. Its 4-pin GR10q fitting retrofits to existing light fixtures, meaning installation requires no additional rewiring. With a 40,000 hour life and a 3500k neutral white light. Can be used outdoors with a suitable IP65 rated fitting. Only for use with high frequency ballasts.