Hi, The latest idea for growing plants under lights is to use red and blue LEDs - plants reflect all the green light. Speculation is that this technique will make growing many crops in England in Winter viable. LEDs are more efficient than older light sources. ebay.com (home of cheap and cheerful LEDs from China) knows all about: LED grow light I wonder if anyone has tried these? -- David Pilling http://www.davidpilling.com/