400 watt magnetic from htg supply , drove to their store when they opened back in 06. still running but grounds managed to loosen themselves up and ignitor circuit stopped working until thy were retightened
the part holding co2 will be sealed from all leaks, and since co2 is a very dense gas it tends to pool on the bottom, only the very top of the box is vented with a small 50 cfm fan to keep temps under 90 and above 85. and i honestly cannot understand people citing a co2 "calculator" for the...
which is why a calculator is pointless in the first place. you dont want it to reach 1500(in my case 1100) right away you want it to take 1/6th of an hour or 10 minutes to reach that level. if you have a monitor, solenoid valve and a controller there really is no need to use a calculator. that...
the only industrial grade that is near food grade is from welding supply stores, impurities in gas means sloppy welds, alot of times at your local beer distributor it will have a decent quantity of nitrogen in it. the other option is food grade, mostly because it has glass lined cylinder walls...
first of all , only food grade co2 is 100% co2, that and welding supply stores
second that calculator only takes into effect how many cfh it takes to reach your optimal co2 concentration in an HOUR.
and thirdly if you know someone who gets 437 days out of a 20 lb co2 tank give me his number...
another thing take what some of the people have to say on this forum with a grain of salt. a co2 calculator sure looks spiffy, but you should be relying on a co2 monitor not guess work to determine co2 concentration. depending on if your grow room has any leaks, running timed exhaust cycles etc...
2x2 is 4 sq ft so 2875 foot candles. and thats right on it inverse square law will make it alot less intense. might i suggest getting a good light meter, one that reads fc and lux and measure the outside light from the sun at 12 noon should be around 10,000 fc. go to home depot with your light...