CMH 315w VS 400w HPS Heat?

[crow]

Anyone that thinks the 315w will equal a 600w hps for anything, is in for a rude shockThey are a good complementary light to run with hps's or a small grow in a tentthat's where mine is going soon when its not being used as a heaterwould need at least 5 315's to equal 3 600'sAll my opinion of cause and no doubt completely wrong

Not sure about your opinion re "cause" but I do agree that 5 x 315w cmh would support similar results to 3 x 600w and with less power draw.

[pedro de pacas]

I believe the op was seeking comparison of a 315w to a 400w. Pretty hard to assess the heat output of a 315w if you're running 2 x 600's either side I would have thought

I look forward to a true comparison of room temps of 1 x 315w vs 1 x 400w with no other heat source.

Gives a hour or so and I will, the hand often lies

 

Got a pissy little tent, will give them 15 mins each, ballast in and out

Edited July 10, 2017 by pedro de pacas

[crow]

Gives a hour or so and I will, the hand often liesGot a pissy little tent, will give them 15 mins each, ballast in and out

Pedro I'm genuinely interested in this as a controlled experiment. Can you test one today and one tomorrow, else the tent will already be warm for the second light and skew the results? And thank you for going to the effort of testing this out (not sure I could be arsed putting up a tent for such a quick experiment!)

[billygoat]

is heat not directly proportional to the number of watts ?

[pedro de pacas]

Pedro I'm genuinely interested in this as a controlled experiment. Can you test one today and one tomorrow, else the tent will already be warm for the second light and skew the results? And thank you for going to the effort of testing this out (not sure I could be arsed putting up a tent for such a quick experiment!)

Its fucking freezing here , but yes I can. 400 today, 315 tomorrow

[crow]

is heat not directly proportional to the number of watts ?

Physics was never my strong point Billy but I think the following makes sense...

 

http://www.reptileuvinfo.com/html/watts-heat-lights-lamp-heat-output.html

 

 

One of the basic laws of physics is the law of the Conservation of Energy. This simply states that energy cannot be created or destroyed, it can only be transferred from one form to another. So when a 100watt lamp is switched on, 100 watts of electrical energy is converted to 100watts of light and heat; a 50watt lamp produces a total 50 watts of light and heat, and so on.* However, some lamps are more efficient at producing light than others; this determines how much of that 100 watts is transformed into light, and how much is "wasted" and comes out as heat (very useful, though, if what we want is a basking lamp).

[pedro de pacas]

Away we go

Tent temp 5c

[crow]

Away we goTent temp 5c

Shit, 5 degrees! You're not giving me much incentive to return home to Vic from the Gold Coast tomorrow

[Gazza2001au]

I found a place that sells the dimmable 315w cmh which would suit my needs perfect i am sitting on it tho weather to buy or not, for half the price i could buy a Viparspectra 600w led or for nothing i can run my 4 cob's just really over the diy shit

[Partimus]

If budget isn't an issue and you are tossing up between a 400 hps and a 315 cmh and heat output is your deciding factor then I would say get a 315 cmh hands down. If you have good enough air flow and heat reduction to handle a 400 then you will be fine with a 315, most likely a bit cooler and save a bit of power while you are at it. if price point is the issue then cmh is probably not a viable option but if you can afford it you wont be disappointed with a 315 from my experiences.