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Propagation lights provide an intense blue spectrum of light ideal for vegetative growth.

They are largely used over metal halides because they use less electricity and generate less heat allowing the humidity to be on the high side, which is preferred by young plants whilst still providing enough of the correct light.

A 110w propagation unit is equal to a 400w metal halide bulb, so you can reduce your electric bill whilst you increase your humidity and get better results.