My common sense dictates to go with what nature does.I was thinking to even use less light or similar to veg light in my flowering room.UB i was thinking to do a 1.5x1.5x2m room with a 400watt bulb,and a veg one with the same.Do you think it would work ? Or would i need a 600watter for the flowering ? I'm very careful and i always listen to your ways.I just want a small tap on the back and a direction on what to do
.Plants will be topped once again for 4 colas..It's just so nice to see them grow like that
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MY bathroom is only 5 feet wide. 1.5 meters = 4.92126 feet. And I have an extra meter in length. Veg, you can use CFL at 250w. Cost less that HID. And it doesn't have that big heat load. But, if you have two rooms that size, you can go with a 1000w in each....if you can transport out the heat.
400 will work and 600 will work. What didn't work for me was 400w in large garbage bin. The critical thing for HID is overhead room or if vertical, the side space before the light.
That is about the intensity more that the heat, although heat is always a problem. What you are interested in here is the foot-candles. There are many ways to measure light that are good for people and photography, etc.
FC is about intensity. Sun in the afternoon max, gets to 10,000 foot candles. It is only there for maybe 1 hour.
My 1000w HPS, gives off 10K FC, at 26 inches. And by the time you get to some of these recommendation I see, 8 inches...????!!!!, you are 4 x sun power. I have burned them, and when they are light burned they seem fine, but the cure was a horror. I could not smoke it, when the chlorophyll was gone.
That just means, you need more room, not for the heat, but to bring down the intensity. 400W HID is a 120 gal garbage bin, will not work.
The other thing is yield. Yield is watts and more watts means spacing and distance must increase. So, Ben and I are on the same page here.
But, he is outdoor and seasonal, I am on a harvest each month schedule. Really., your situation is unique, and you need to get something going that is not too much or too little for your location, situation, and funds.