Save 33% of energy with this White A15 energy saves halogen bulbs. This 40 Watt bulb is equivalent to a 60 Watt bulb. It uses 120 volts, and it is 3000 Kelvin. It is dimmable, mercury and has 1500 hours of life. The light bulbs come packaged in a 5" x 7" x 2" in a hanging blister pack with two light bulbs.