Only one double fitting can grow many plants until they about 2 weeks old. As they grow taller the light is too dim at the sides and bottom of plant, more tubes will be needed to light these parts of the plant. The light from fluoro's needs to be very close to the foliage about 10cm. max., heat may cause burning or curling of the leaves if there touching the tube. If there are 6 large plants they will need 10 or 12 of 36 watt fluorescent tubes.

I used Fluoro's on my first 2 indoor crops starting with 4 tubes then adding tubes every week or two, as this was all I could afford. this setup soon supplied us with plenty of smoke and a quality that made buy on the street pointless. Before this I always been broke or in hock, paying for smoke and after while growing and not buying a could afford to get a 400watt HPS fitting and Son Agro glob. I was amazed at how the growth rate and strength improved as there was improvement in growth when I changed from soil to hydro growing and when they were grown under fluoro lights got better .