The compact fluorescent spiral Hydrofarm Light bulbs provide the light you need while reducing energy costs. These work great in Hydrofarm's Dayspot grow light and fixture, but will actually work with any fixture, and save you money. Not only that, but it's UL listed. The FLC32D Hydrofarm Light bulb is a 32 watt/65K bulb, which is equivalent to a 150W incandescent bulb. Produces 1900 lumens and will last an average of 10,000 hours.