Zapp Pure 20 / 3300 Replacement Bulb ZP20L Zapp Pure 20 / 3300 Replacement Bulb. These units are truly high performance/high intensity units utilizing over 70,000 microwatts of killing power. Few UV's can make this claim. 9,000 Hours of Bulb Life. 1 year warranty on the lamp. Draws only 86 watts.