Included in this purchase is a single BA15D xenon krypton gas bulb. Each bulb is 60 watts with a clear glass globe. These tubular shaped mini bulbs have a double-contact bayonet base. Their dimensions are ‎2.25 x 0.38 x 0.38 inches each. Using the same bright white light as a halogen using pure xenon gas from Japan, Xenon and Krypton gas is considered the original halogen alternative. They can produce more lumens and brightness with less wattage than incandescent and halogen bulbs.