If you can add a fluorescent strip light inside of your fixture that may be a good solution.
According to the IES (Illumination Engineering Society) competitive billiards has a 50 foot candle recommendation. 1 foot candle is 1 lumen over 1 square foot. If you were trying to light a 4-1/2 x 9 table ( a little over 40 square feet) you would need 2000 lumens to the work plane which in this case is to the cloth. You can usually count on approximately 50% of the lumens from the fixture to be lost (due to ballast factor, dirt, lumen depreciation, fixture design, etc) so you would need a source of 4000 lumens to be safe. A better quality T8 lamp has over 2300 mean lumens per lamp so assuming your fixture was designed as such where it can be mounted at a height where most of the light was focused on the table a 2 lamp T8 would be ideal.
The good thing about a fluorescent lamp is that lamps can easily and cheaply be changed if you do not like the color of it. I have a good mix of customers who like 3500K, 4000K, and daylight. One thing to remember is that when you use a different color temperature the balls and cloth may appear a different color (ex. a 3500K will make the seven ball seem really red but may make the two ball look funny.