Bulbrite H39PAR20SP/ECO 39-Watt ECO Halogen PAR20, 50W Halogen Equivalent, Medium (E26) Base, 120V, Spot Included in the box is: 1 - 39-Watt Halogen PAR20, Spot Eco Halogen bulbs are the perfect replacement for an incandescent PAR reflector and can be used anywhere a standard reflector would normally be used Eco halogen bulbs are 25% more efficient than standard incandescent equivalents with the same functionality 39 watts; 550 lumens; 100 CRI; 1,500 hour average rated life; Medium (E26) Base Dimensions: Maximum Overall Length is 3.13 (Inch); Bulb Diameter is 2.5 (Inch)