How soon to put under Metal Halide

Anone know how soon or from a seedling you can go from Flouresent light (1cool-1warm) to Metal Halide 400watt, and how high should the lighht be away?

Thanks.

FlyinLow&High said:

Anone know how soon or from a seedling you can go from Flouresent light (1cool-1warm) to Metal Halide 400watt, and how high should the lighht be away?

Thanks.

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Any time you think they've outgrown the space. 12 inches away would equal full sunlight so I'd start at 16 inches and drop it down an inch every day to 12 to get them adjusted to the stronger light.

frmrboi said:

Any time you think they've outgrown the space.

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Not sure by what your saying Out grow the space. I start my seed in paper towels 24hrs until 1/16 root is showing, then put them in starter plugs kinda like rock wool but these are soft spoungy brown, then in a starter tray and they pop in 4 days, then when they have roots showing out of the bottom (6 to 8 days), I put them in 16 cups. I would like to put them under Metal Halide asap, but I am thinking to wait another 7 days just so they dont get hot or stressed.

and thanks for your reply.

FlyinLow&High said:

Not sure by what your saying Out grow the space.

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when the plants are so big the light isn't covering all the leaves anymore, but you can change ANY time you want. I like to grow my seedlings outdoors if it's warm enough.

I use flouros for about a week or so then switch to MH. I just put my hand by the tops and make sure its not hot.

Thanks guys, I just wanted to make sure I was not putting them under MH too soon.