Ginnas, If you're going with 6 bulbs, then choose the warm with higher wattage. You can find the 42W that are appx. 3000 lumens per bulb at most box stores (under $10each). Even with 6 bulbs (appx. 18000 lumens), you will have to train the plants to stay close to the light. Plenty of growers use warm bulbs for their entire grow. I would try two plants with that amount of light.