Use these bulbs wherever a larger and brighter flame bulb is desired. The CK1010-3 and -4 bulbs may be used with any 12-volt transformer and the CK1010-26 bulb with either a 1.5-volt battery or the CK1009G transformer. The CK1010-26 bulbs may be made into clear Christmas light strings by assembling 12 bulbs in series and connecting each end across a 12-volt transformer. Current drain is approximately 40 ma for the 12-volt bulbs and 55 ma for the 1.5-volt bulb. 5,000 hour bulb life.