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Is there an FAQ on the trichome vs. "effect" and harvesting details? I need a microscope anyway, now I have yet another excuse to buy one :-).

I'm 4 weeks into flowering.... how much longer? I have a bunch of different strains in there, Sour Diesel, Confidential Cheese, Blueberry Cheese, Chernobyl, and Super Grape Ape. My grow journal is here: https://www.rollitup.org/grow-journals/417369-mmj-400w-mh-hydro-grow.html

So... how soon do I harvest? Things are going fantastically well:

Here's a closeup of a flower, 3 weeks from 12/12: Here's the whole garden, 3 weeks from 12/12.

So it's been almost two weeks since my last update, and now the plants are bursting with flowers. Trichomes are starting to appear on the leaves near the flowers, and all is going smoothly. I just returned from a 4 day vacation to the mountains, and the difference is HUGE! Here's some pics...

They'll be fine for now, but a bluer spectrum (cool white) is better for vegetative growth. The warm white will work well for flowering though. You'll be fine :-)

Heat of fusion of water (ie, heat absorbed when it melts) is 334 kJ/kg. I'm ignoring the temp of the water because that effect is small compared to the melting of ice. A 2L bottle has 2kg of water in it... so that's ~700,000 J. 700,000J/(24h*60min/h*60s/min)= 8J/s, or 8W of cooling for two...

The CFL is a lot more dense and has no cooling fans... a 90w LED is really an array of probably 30 3W leds, so that's why it's cooler to the touch. So, adding fans inside a closed system will really not cool it down, it will heat it up. The fans are preventing hot spots by moving the air...

Well, if you just want to know how much heat, thats 600W * 12h = 7.2 kWh, or ~25,000 BTUs. If you wanted to know how much airflow you'd need to remove that heat and maintain the temp in your grow tent at 90°F (32.2°C) assuming an ambient air temperature of 70°F (21.1°C) and neglecting heat loss...

The heat generated by a plasma bulb will be the same as it's wattage, just like with all electronic devices.

Do you want to know how much hotter a 400W HPS will make your cabinet? Or if going to CFLs will keep your temps under control? Ask away, and I'll walk you through the solution. (thermo engineer here :-) ). I'll start off with: "A watt is a watt is a watt." Any light bulb of any kind...

Here's the canopy after training earlier today and a little growout (you can see the nice thick canopy and the low growth below it): Higher resolution image compliments of imgur: http://imgur.com/W3FAM

Hey all, I'm running a homebuilt ebb and flow hydro system with Hydroton and Cutting Edge Solutions nutrients, all in a 2'x4'x4' grow tent with a single 400W Metal Halide. I switched to a ScrOG method once I realized how much more efficient it is, especially in my relatively short enclosure...