temp is 80f with 400 watt hps, how much with 600?

[Oxygen_Man]

If my air temp with lights on in my cab is 80f all day long, how much more will my internal temp rise in a 3x3 foot tent if I put a 600 watt hps in their?

 

[187020]

Well if I stepped up my lighting I'd assume added ventilation/cooling is in order !! Peace

 

[spadedNfaded]

Oxygen - I am using a very similar setup to yours. 400w, 3x3 tent and thought about switching from 400w bare bub vert to 600w horizontal.

Like Cravenmore said, i also included either a cooltube or a cooled hood of some kind as a necessity.

Are you using a cooled hood/tube right now? Will you be using one in the future? Or a bare bulb 600w w/relfector

- SubN

 

[Phaeton]

Assuming everything else is equal (never is) and the 80* constant is due a steady state temp intake w/o AC, then the cooling air would almost need doubled. 6" fan to 8", 4" to 6", not as much as it sounds.

Not equal:
humidity
ambient/tent temp ratio
tent material conductance
transvaporization rate (surface evaporation + leaf transpiration)


This is gaming, it will work fine, stick a thermometer in the canopy, shoot for 81-85 degrees, heck, this might be just what's needed to get the chlorophyll up to max efficiency temperatures.

The temperature rise is not going to be major, and 67 watts/square foot cools fine, many have more. I use 88 watts/foot and only exceed 86 degrees if the ambient exceeds 82, no AC.

77-86 is the target, the closer to 86 the better. Over or under shows a dramatic falloff in production. :kitty:

 

[señorsloth]

86 is optimum huh? i mean i guess that makes sense since that is like the general temp where they are from, at least i have heard anyway, near the equator there isn't any seasons so they would pretty much get that year round...

to be honest i have never heard what temps were optimal, my 400 keeps my cab at 82 all day but it's a smaller cab. it's nice to know a number though, since i've basically just tried to keep it as low as possible, now i know i have a few degrees to work with...

 

[Phaeton]

Yeah, over in the science section Spurr keeps kicking out articles and research relating to growing. The temp range was one of them I could understand. I went from the mid 70's to 82-86 about 6 weeks ago. The faster growth is visible, but so is going over temperature on hot days. Overall I come out ahead.
Research also said the same temps apply at night, even day/night temps produce less stretch. Have not been able to keep the budroom in the 80's with the lights off so I'll file that one under 'interesting'.

 

[RicoT]

I'm working with a 3x3 space as well, and have been for a couple of years, in a closet split vertically veg/flower. For a while I tried my hand at vertical using the 600w, and it was a tight rope walk between really fat ass dense buds and bleached spots. I switched to horizontal and have a more beautiful 1gal sog than I could've ever imagined. I don't see why you couldn't hit a # easily first sog 600w horizontal.

Edit: I'm high, and totally missed the point of the original question. As for temps, like someone said if it becomes an issue which it might, upgrade ventilation. I'm using a 6" S&P inline for my entire closet, with supplemental A/C and it's pretty optimal.