Satco's 4 watt T5 LED Type B miniature bi-pin replaces traditional linear lamps with a no ballast, no external driver option for lasting retrofit conversion. With double ended wiring for convenience, the frosted bulb has a temperature of 4000 kelvins and a lumens count of 400. Providing 50,000 hours of cool white light, this bulb is PET coated for shatterproof protection.