Helen
You may not have a choice of florescent tubes to use. Your fixture may only except t12 bulbs or it may only except t8 bulbs. In either case I would use a mix of cool white and warm white. The cool white gives you the blue light needed for growth, the warm white gives you the red light for flower production. The standard 40 watt or 34 watt will do fine for growing. The plants need to be about 6 inches from the lights and be on for no more than 16 hours a day.
Jayme
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