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    Humidity and lights

    Bro: I've been told, and myself do it as follows: use a inline blower dedicated for just your lamps, take air from outside the tent and blow it across the lamps (ie - don't suck it across them lol). Use a separate fan on your scrubber/carbon filter or my guess is that you're thinking is...
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    Exhaust Fan Size Calculation - Am I Doing It Right?

    Hello: Have a 12x8x8 room, and would like to get your suggestion on that size of exhaust fan that I should employ for this application. I will be employing (4) 600w HPS lamps, and using a Carbon filter. My calculations are 12x8x8=768ft^3, but if I add 10% more volume per 600w lamp for a...
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    Carbon Filter - Limiting Airflow, but by how much???

    Hello All: My room is 12x8x8 (768 ft^3). I used the rule of thumb that the air should be replaced every 5 minutes to choose an exhaust fan, and as a result I got an 4" 177 cfm inline fan. What I failed to consider in the fancy calculation is that I have a carbon filter through which the air...
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    Droopy Leaves!

    Thanks for your reply. Lights on, temp doesn't exceed 80 F. Lights off, temp no lower than 70 F. The humidity is between 40-45%. On a side note, after reading Roseman's columns, I have switched the water pump cycling to 1/2 hr ON every 6 hrs. Reservoir temperature has dropped by about...
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    Droopy Leaves!

    Hello: Got some fairly decent little bushes going in a couple different BP units, they have been veg'ing about 3 wks or so. As the title of the post states I'm seeing some droopy sad-ass looking leaves on the plants, oddly enough more so later on in the day, whereas earlier in the morning they...
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    pH in Reservoir: gotta go from 7.9-->6

    Erks: Thanks, that is about what I had guessed. Lowered 'em already .3 already, guess I'll do another tomorrow. Damn I guess it'll be about 5 days until I'm at 6. BTW: Funny you mention that, cuz when I got the meter last night the first thing I did was mix up a fresh res-swap worth of...
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    pH in Reservoir: gotta go from 7.9-->6

    Hi Bubbleheads: First off, I'm glad I found the site, you guys have a wealth of knowledge to share and for that I'm very thankful. My inquiry: 14 day old seedlings in BP unit, just got my pH meter today and found the H2O is 7.9!!! How can I safely lower to the prescribed 6.0? How much...
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