Are leds a lot cooler than hps?

428grower

428grower

Well-Known Member
I've noticed a huge difference in switching. If not supplemented with an AC my closet would get up to 97 with a 600 watt hps and even with a 315 cmh it would get just as hot. I put a luxx 645 watt led up and my max heat with zero extra ac other than my surrounding house ac being vented into the closet it does not get over 85 degrees which in my opinion is the sweet spot for the types of cannabis I grow while my house is sitting at 72. I'm happy I switched.
 
Rurumo

Rurumo

Well-Known Member
Short answer: no. I'm extremely aware of temps due to my 4x4 tent being in a 400 sq ft room. Watt for watt you are generating close to the same amount of heat. The difference between LED and HID being, with HID you are also blasting IR down on your plants, so they will show signs of stress at a lower ambient temperature than LED. Comparing a 630 CMH to about 550 watts of LED, both completely heat my place during the winter when it averages 20 degrees out to the point I have to regularly let in cold air from outside because it starts creeping up into the high 70s. I noticed zero difference between the two. BUT, the LED allows me to keep growing during the freak summer heat waves we've been having even when it gets into the 80s in here, when the CMH would have fried everything.
 
G

Grojaks

Well-Known Member
Rurumo said:
Short answer: no. I'm extremely aware of temps due to my 4x4 tent being in a 400 sq ft room. Watt for watt you are generating close to the same amount of heat. The difference between LED and HID being, with HID you are also blasting IR down on your plants, so they will show signs of stress at a lower ambient temperature than LED. Comparing a 630 CMH to about 550 watts of LED, both completely heat my place during the winter when it averages 20 degrees out to the point I have to regularly let in cold air from outside because it starts creeping up into the high 70s. I noticed zero difference between the two. BUT, the LED allows me to keep growing during the freak summer heat waves we've been having even when it gets into the 80s in here, when the CMH would have fried everything.
Click to expand...
You’re afraid of high 70’s temps?
 
hillbill

hillbill

Well-Known Member
You could run 40% less watts of HPS with the same yield and maybe higher quality bud. I switched years ago. This only applies to the better bar and Boards.
Using less watts will result in far easier cooling. LEDs also lack the huge IR spike of the HIDs.
 
getogrow

getogrow

Well-Known Member
Imo , the light output of leds are double. 1000hps is easiely replaced with 480w qb boards. I also use bar style lights at 600w each. They put out a tad bigger spread then qb's.

Roger explained the heat in real world terms. A watt is a watt. HPS dont actually run hotter, they just have more watts and IR. This is why i question if my partner and @Star Dog are really correct when they say hps is better for winter months....

In my fucked up head , its still wasting money on electricity but im backwards as it gets.
Ex: Replace a 1k hps with a 480 Led and that leaves you 500 watts to run a heater or anything else that creates heat. Co2 generator maybe ?

Since the hps are already hanging and doing their job, i suppose it is easier an cheaper to stick with hid. :eyesmoke:
 
hillbill

hillbill

Well-Known Member
Boards and bars can be run quite close to canopies and seems that the plants like that boost in leaf temp compared to older white discrete diode panels that were lensed like a51 and Apache at the time.
 
getogrow

getogrow

Well-Known Member
Hiddengems said:
A watt is a watt. But a higher percentage of input energy goes into plant growth (work) with led than heating the environment.

Energy is conserved by conversion into mass.
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Agreed.
But i still say a 600 watt led is putting out the same amount of heat as a 600 watt hps minus the ballast.
60% of the hps light goes to the plant....40% goes to heat.
90%+ of the led light goes to the plant ....<10% goes to heat.
ALL 600 watts of both lights go to heat. Some lights waste more watts then others.
 
H

Hiddengems

Well-Known Member
It's impossible for energy to do two things. Any higher photon absorption by chlorophyll is less heat to the environment.

conservation of energy.
Energy converted to sugar is effectively removed from the system, being locked up in mass form.
 
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