The Flashpoint Flashtube for 620M Monolight is a us er-replaceable, 300 ws tube with a UV coating and a color temperature of 5600K. Never touch Flashtubes and bulbs with your bare hands. The natural oils from your skin will deteriorate the bulb's lifespan. Always unplug the strobe and clear the capacitor before changing the flashtube. If you do not have experience changing flashtubes, please take the unit to a certified technician to complete the operation.