The main goal of a billiard light is to adequately light the entire surface of your table including the top of the rails and also allow enough room to shoot and maneuver under the light. With most fixtures the distance from the bottom of the lamp shade will be 36 to 42 inches above the playing surface. When lighting your pool table, it is important to take into consideration the length and width of your fixture and pool table.
A fluorescent bulb whether a tube style or energy efficient bulb, provide the most even lighting across the playing surface. Most billiard lights out there offer a three or four bulb lamp. Typically for a 7’ & 8’ table you will choose a three bulb lamp and a four bulb lamp for an 9’ table. However, this is going to be based on your room and many other unknown factors.
The World Pool-Billiard Association (WPA) has a set of standardized rules for billiard lighting. But as stated earlier, each room, home and persons needs are different. For their “tournament” standards, please check out their website for more information.