I use the the T5 Fluorescent Grow Lights for my grow tent, they are extremely efficient at providing good light and will give you about 15000 lux at 1 meter high above your plants, the tubes are 5/8 of an inch in diameter thats where the 5 comes from.
At 54 watts per tube and with 8 tubes you are using 432 watts which on my electric tariff is 12p per KWh @ 24 hours a day cost £1.24 so it costs about £52.00 for 6 weeks . You can buy them here
These are what you need to do to grow Giant Onions, Pot and Blanch Leeks
For Blanch Leeks and Pot Leeks use at 12 hours a day so the cost would be half the above.
Here is an image of mine, click to enlarge….
They are switchable from 8 tubes to 4 tubes. For propagation there is nothing to beat them and growth is extremely fast with dark green short leaves. In a Grow Tent you rarely need extra heat as the beta they give off is sufficient but they dont burn. In 10 weeks you will have very large plants for planting out.
