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Growing under Lights

How high above plants for HID light

20 years ago

I just got a Sunsystem II 250 watt MH light to use to start tomato and pepper plants. I've searched and cannot find how high the light should be above the plants. It seems like I can light an area up to 3' square with the light, but how high above the plants should the light be?

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Comment (1)

zink
20 years ago
pdxman1,

There is a worderfully simple test to determine this. Hold you palm over the top leaves. If the back of you hand is not getting too hot, you are OK. This is also assuming that your plant weren't just moved from a very low-light situation to the MH lamp. If so, place the light higher for a few days until the plants start to look like they are really digging the light. Then do the hand test.

Zink
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