The term 'BULB MEASURE' is used to refer to the amount of energy a light bulb uses. The two crossword solutions for this term are 'WATTAGE' (7 letters) and 'WATT' (4 letters). The unit of measurement for this energy is the watt, which is abbreviated as W. A watt is a derived unit of power in the International System of Units (SI). It measures the rate of energy conversion or transfer with respect to time. Therefore, the wattage of a light bulb is the amount of energy it consumes per unit of time.