Approved for totally enclosed fixtures, the Satco S8209 18-watt compact fluorescent light bulb has an instant-on quality that emits an inviting cool white, 4100K color temperature. This self-ballasted spiral CFL will save on energy consumption, reduce light bulb changes, and lower greenhouse gas emissions. Replace your 75-watt incandescent light bulb with the Satco S8209 compact fluorescent and start saving now!