How Much Hotter is 600w vs 400w?
- Thread starter kappainf
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ak.fortyseven
Well-Known Member
I've used both, the 600's penetrate the canopy way better than the 400's. i think the benifits out weigh the additional heat.
HeatlessBBQ
Well-Known Member
ive used a 400 watt with little cheap 45 doller hood w/ no glass sheild. it produced a lot of heat.
im now using a 600 watt with air cool hood with no inline fan. it has a glass sheild.
the 600 is a little less hot then the 400 without the glass.
my homie has a 400 watt with a 4 inch inline fan with aircooled hood and it isnt hot at all.
you could put the glass right up to the plants with it but i wouldnt.
the inline fan and ducting really does help if you can get yourself one. along with an air cooled hood of course.
even though those 45 doller hoods can be cheap and a last resort with short cash for 400 watts...i wouldnt get one.
over all....get a 600 watt with aircooled hood AT LEAST.
then upgrade to an inline fan and ducting to that shit. youll be good =]
im now using a 600 watt with air cool hood with no inline fan. it has a glass sheild.
the 600 is a little less hot then the 400 without the glass.
my homie has a 400 watt with a 4 inch inline fan with aircooled hood and it isnt hot at all.
you could put the glass right up to the plants with it but i wouldnt.
the inline fan and ducting really does help if you can get yourself one. along with an air cooled hood of course.
even though those 45 doller hoods can be cheap and a last resort with short cash for 400 watts...i wouldnt get one.
over all....get a 600 watt with aircooled hood AT LEAST.
then upgrade to an inline fan and ducting to that shit. youll be good =]
ak.fortyseven
Well-Known Member
To answer your question a lil better: youll need enough height to have about an additional 6 inches distance between your plants and the bulb. I never had heat issues, so i never actually measured the aditional heat produced by the 600, but i did notice the additional bud in my bag after the grow 
Woomeister
Well-Known Member
33% more heat, obviously.
Woomeister
Well-Known Member
In my experience it does mean exactly that.
northeastern lights
Well-Known Member
My 600's aren't much hotter than my old 400's. I air cool mine and am making a light cooler. I'm using a truck oil cooler.
Cool, good luck with that.
RyanTheRhino
Well-Known Member
how big is your room.. i can calculate if for a static room.
RyanTheRhino
Well-Known Member
i came out with aprox... a 400 watt hps in a 16 square foot room will chnage the temp +.48294(F)/per hour
i under stand that if i say that you would think the room heats up forever but it will stop because of special laws.. i am only using these 2 points to figure out the % diffrence
so for a
400 watt = +.48294(f)/per hour
600 watt = +.72135(f)/ per houre
A 600 watt hps is 34% hotter
i under stand that if i say that you would think the room heats up forever but it will stop because of special laws.. i am only using these 2 points to figure out the % diffrence
so for a
400 watt = +.48294(f)/per hour
600 watt = +.72135(f)/ per houre
A 600 watt hps is 34% hotter
RyanTheRhino
Well-Known Member
thats just a static answer the hoter the room the less the temp will change till it almost wont heat up any more i used a 70(f) room
RyanTheRhino
Well-Known Member
well i just lit up so im done with math... plus u would have to give me like 20 diffrent data points... so if you think your setup could handle a 34% increase in heat go for it....
if anyone is wondering how i did the math.
i started off with the watts (1 watt = 1 joule/sec) after that i have the energy to pluge into
q=mc(delta)T
q= energy = 400j/s
m= mass = 1.5g/per 16square foot room i had to use Pv=nrt to find that out
c= heat capacity of air= 1.012kj/kg
DeltaT= temp change and thats what i solved for
for the mass
pv=nrt
p = pressure= 1 atm
v= volume = 125 cubed meters
n= moles = solved to be = .052
r= constant.= 8.314
mass = moles/ atomic weight
atomic weight of air is 28.97g/mol
northeastern lights
Well-Known Member
RyanTheRhino
Well-Known Member
E=mc2
E=mc^2 is for electromagnectics.....bla.bla.lbal.bla.bla... photons
e= energy
m= mass
c= speed of light^2
Well, the 600 is in the cab and heat is not an issue. The only issue I forsee is rock hard heavy nugs. 4.5 square feet and a 600 watt bulb, is this overkill? I ask because I think the cab can take even more watts. I have the 600 watt quantum dimmable ballast, I wonder if I could get the quantum 1000 watt dimmable ballast and run it at 75% power. Would a 1000 watter at 75% produce more light than a 600?
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