Update, They are the Revolution T8-18 replacement bulb by Starlights Inc. 200% more efficient than a standard fluorescent tube, draws 623 milliamps, 810 lumens, 4500K, says 9-25v 7.1 w, although elsewhere it says that the pulse width modulator guarantees the same light output regardless of voltage fluctuations (11-16 volts). 60,000 hour life expectancy, lasts 12 times longer than a standard fluorescent bulb. Two wires to hook it up and you use the same end brackets. Has a ratcheting design that lets you point the light to the area that you want lit up most, has a light pattern up to 160 degrees.