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New Lights
GrannyHo

Registered on
Dec-30-2007
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Message #41344 posted by GrannyHo (Info) April 05, 2008 15:20:38 ET

I just invested in a Sunlight 400W MH conversion and HPS light system. Its been in use (the MH bulb because they are in the revegging stage) for about 3 days now and I've noticed the dirt has dried out really fast. I have them in big pots and previously watered them once a week. This week I've had to water them twice. I've got them so that the tops are 24" below the light. Is it normal for the dirt to dry out so quickly under this light? I wouldn't have watered them twice just because the dirt was dried, but they were looking a little droopy. They did perk up after the second watering.



Re: New Lights
del... *
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Registered on
Feb-22-2000
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Message #41347 posted by del... (Info) April 05, 2008 16:44:29 ET
In Reply to: New Lights posted by GrannyHo (Info) April 05, 2008 15:20:38 ET

one should never judge soil moisture content by looking at the surface. most of us judge it by the weight of the pot and i allow them to wilt a bit between waterings. the top couple inches of soil does dry out fairly quick, especially when the fan is running over the pots but there's plenty at root level, where you want it. you can also check the drainage holes in the bottom of the pot but that gets kinda messy...at any rate, ya gotta water them when they need it and twice/week sounds about right...in my situation anyway. i use those #5 pots...some call them 5 gallon pots but they don't really hold 5 gal's...and twice/week is pretty much my schedule too.

i use 400's too but keep mine around 12 to 15 inches above the tops.

good luck




Re: New Lights
GrannyHo

Registered on
Dec-30-2007
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Message #41349 posted by GrannyHo (Info) April 05, 2008 17:22:36 ET
In Reply to: Re: New Lights posted by del... (Info) April 05, 2008 16:44:29 ET

I did have them higher the first day and the next morning the tops had a yellow tint to them. I was afraid of burning them. The instructions that came with the lamp suggested 18 to 24 inches above the tops. They look okay now. I can't believe the growth in just the few days they've been under the new light. This is so much fun.



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