A Hampton Bay ceiling fan can use light bulbs of varying sizes. Bulb size depends on the lighting system and fixtures used in connection with the fan.
Some Hampton Bay ceiling fans come with their own light kits, while others do not. In the latter situation, a lighting kit can be purchased separately. To ensure that any light kit bought separately from the ceiling fan unit attaches properly, check the fan's manual for compatible kits. In general, it is more difficult to find a compatible light kit for a Hampton Bay ceiling fan that was manufactured more than five years ago.