Well W for using just one light I have to qoute what Zandor says about it..................."If you could only buy one it should be HPS with one of the enhanced spectrum HPS bulbs. The do offer a color shifted bulb that produces blue spectrum that is good for vegetative growth and they still have the red spectrum for flower".


My thought would be to just go with a Metal Halide for a single light, however I'm not going to even try and go against zandors advice, he is a lot more advanced in his growing than I am.

The Vegitive growing W, is the growing period where we trick the plant into believing it is Summer, and by having a light running 18 hours a day this does that job but the plant does need light from the blue end of the light spectrum to do this growing well, so we choose a light that can provide enough blue light to do this

A plant will not develop buds untill it believes that it is time to do so, we make it think that Winter is coming by cutting it's light down to 12 hours a day
However to get the plant to produce the best buds, it really needs light from the red end of the spectrum, thats why we choose a light that can deliver this.
The MH bulb provides light from the blue end of the spectrum which is ideal for vegitive growth.
The HPS bulb provides light from the red end of the spectrum which is ideal for the flowering.


Honestly W it's not as complicated as it sounds, if I can grow then anyone can


love mand xxx



Oh by the way light is made up of all different colours, humans can only see white light.................the red and blue ones are there we just can't see them