Brunswick (and some others but I forget who just now) currently recommend full spectrum lighting from four foot fluorescent bulbs. Seems they cost about $1,800.00 for one light. I think that two of these lights are needed on a 9 foot table. Here is the URL
http://www.brunswickbilliards.com/brunswick_collection/lights/gold_crown_table_light.html
The recommended "T8" is a full spectrum light. My equipment is important to me but that is a lot for a light. So I looked for other solutions. If you use the full spectrum lights they require a 40 watt ballast. So you have to buy new lamp holders. The lamps have green ends as they are specifically designed for this ballast. I bought two four footers at Home Depot and 8 lamps. Each holds four lamps. Cost about $100.00 (note the reference is $3,600 for two Brunswick lights)
I suspended the lamp holders from two 2X4s screwed together and hung from my ceiling. Here is a photo. Not quite as elegant as Brunswick but ...
Photo was taken with flash (it kicks in automatically) but you can get a pretty good idea about the shadows anyway. Almost all of the light is on the table but I would like more of a pool hall look so next I will use 2’ by 8’ ½ oak plywood stained mahogany and hung at an angle from the lamp base. This will keep the light out of your eyes. I think I will make fake stained glass inserts to dress it up a little.
This system gives me “professional” lighting for a reasonable price. Good color, no shadow problems to speak of and great definition for aiming. BTW "Full Spectrum Lighting" is easier on the eyes and there is less fatigue if you play for long periods of time or so the scientists say -- I do play for long periods of time, hence the hundred bucks is really a pretty cheap investment. To give you some idea about how bright the table is, there is a gas heater, a wood burner, a circulating fan and an air conditioner in the corner on the other side of the table but you can't see them very well in the photo.
Notice the patio door at the end of the room has blinds on it so I can keep out the daylight as needed. Us old guys play during the day too so all the windows in the room have blinds.