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Growing under Lights

does anyone know what I'm talking about-light calculator online

20 years ago

There was once a link, here on GW I think, that was to a website that helped you calculate how many lights you need to accomplish a certain light intensity goal. It was mainly aimed at greenhouse growers but was useful for pretty much anyone. You plugged in the wattage (I think it was HPS/Halide only but I'm not sure), area, height above plants, and desired foot-candle levels and it told you the spacing and how many you need. I have never been able to find it since.

Does anyone remember this and where it was?

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Comments (3)

watergal
20 years ago
Is this it?

Here is a link that might be useful: Light layout
hairmetal4ever
Original Author
20 years ago
Yes! That's it!

WOW it amazes me JUST HOW MUCH light you need!
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watergal
20 years ago
Yes, it does say you need a lot of light. I played with it for a while. BTW, the twin window fan that nygardener suggested is a great idea. I used one for a while - had it in the window blowing out for months, even in the rain and cool weather, until we got some horrid rain storms. The real reason I gave up on it was that I added a humidifier, but the fan seemed to suck most of the humidity out of the air. So I opted for a hotter, more humid room. I grow tropicals, so they loved it.

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