when can you put a clone under a mh??

I know people that use very high powered lamps with their clones.

BUT

Clones really need to work on creating a root system, not huge heavy solar panels. I start with low, but constant light and let them chill for a week or two. Then I transplant under the same low light. When the plants roots pop out of the new medium's bottom, then I begin them under the dimmable ballast on the lowest setting. Each few days (or week depending on my timeline) i turn it up until its at full capacity. If you get eager and put them under a MH or HPS too soon it can really stunt the rooting phase in the clones.
 
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