Blowers do what they are called, they blow air. They work great for moving air for ventilation but they are not that good for air cooled lights, because they lose cfm (cubic feet per minute) very quickly with every foot of duct that you add. In-line duct fan (the 30-50 dollar fans) are for small air ventilation only. Inline Centrifugal fans are the best for air cooled lights. Centrifugal fans do not lose cfm’s as fast as blowers when duct work is added.