The Kichler Signature 2 Light Semi-Flush 3620NI uses 2 x 100W A19 medium base bulbs. Total fixture wattage 200W. What makes this dimmable is the type of bulb you use. Any incandescent or halogen will be dimmable, if you choose a fluorescent or LED, then you have to make sure that the bulb itself is dimmable. Regarding use inside a closet, its very nice and will give you good lighting, however you will need check with your electrician to see if you are allowed to have a open fixture in closest. It may not meet codes for your area.