Replacement for a Standard Incandescent R-40 or BR-40 Light Bulb. Uses Energy Efficient Fluorescent swirl bulb in 15, 20 or 23 watt. Rated life is 8,000 hours. Used with the Highly Efficient Metal Reflector, it Replaces R-40 reflector bulbs. This bulb is not dimmable and must be used in a dry location. Wattages and heights: 15 watts (5 1/4"h) (60 Watt Equivalent) 20 watts (5 3/4"h) (75 Watt Equivalent) 23 watts (6 1/4"h) (90 Watt Equivalent) The metal reflector size is 4 3/4" . Comes in soft white and sold in quantities of 10 pcs/carton.