For lights, consider replacement costs, energy use and the hassle of changing bulbs. Halogen incandescent77 wattsHalogen gas such as iodine inside the bulb prevents wear on the filament, allowing it to glow brighter. Traditional incandescent 100 watts Electric current heats an incandescent bulb’ tungsten filament until it glows.Compact Flourescent Lamp (CFL) 23 watts Excited gas in a CFL tube emits ultraviolet photons, which coax the bulb’s coating to emit visible light. Light-emiting Diode (LED)20 watts An LED bulb contains many small semi-conductor units, each emits light when a voltage is applied Also we have a brochure on energy efficient lighting View pdf (144 KB) Pick the right light they contribute up to 8% of your electricity bill Energy saving tips click here