Lighting: Fluorescent - The bulb is an 18" 15 watt Cool White bulb that fits in a 21" light assembly. You need 21" of additional lip space to add another light assembly to a hood. It is recommended that additional lights be added in longer hoods. Additional lights come on the back side of island hoods. One light comes with each single or dual wall mount blower, two lights come with each dual island blower, and four lights come with each cluster blower. Halogen - The halogen lighting system has become more and more popular since its inception. The number of halogen lights directly corresponds to the width of the hood. The halogens include 50 watt halogen bulbs, switched together on a two step dimmer switch, giving the customer two different choices of light intensity. Vent-A-Hood halogen light hoods are UL listed for damp environments. Halogen lights are available in most standard model hoods with the exception of the Tilt-Out, Under Cabinet Flair, Custom Hoods less than 18" deep at the bottom, and selected remote blower hoods. - Transition to 8" Round Included with each Dual Blower Equivalent CFM: A typical hood with a 600 CFM Magic Lung blower is capable of handling professional style cooking equipment with 900 CFM requirements (as specified by the range manufacturer.) The Magic Lung blower performs better because it uses centrifugal filtration instead of mesh or baffle filtration.