Some will disagree, but i believe 600w produces the same amount of heat with hid as led. The way it radiates is different, but ventilation needs will be the same.
I agree 100% about the heat, but I welcome any heat I can get in my new room.
I had cooled hoods so that is how i kept heat down with 1000 SE hps. How do you cool one of these things?
You need less watts, so less heat. Depends on the space, but a 5x5 could go from 1200w, to as little as 900w.
So not a lot of heat above, near the driver. So focus on moving air across the canopy. Thanks for the input.I just switched to LED from air cooled hoods myself. I noticed most of the heat stays trapped under the light itself.
So what I did with my 4 x 4 tents was keep extracting from the top on one side of the tent and closed up all the other top openings real tight. Then I used 6" duct from opposite sides on the bottom of the tent for intake. This air blows underneath the light from both sides and pulls all the heat to the top where it is extracted.
Tent with light hanging:
View attachment 4714258
Top extraction:
View attachment 4714259
Bottom intake 1:
View attachment 4714260
Bottom intake 2:
View attachment 4714261
I think I will eventually use 4" duct and wrap it around the inside of the tent going from one side to the other. Then slice small slits in it every 4 to 6 inches or so. This way I can get a more even flow of air coming in from around the bottom of the tent and out thru the top.
The spoon and fork on the light are counter weights till I figure something out
So my post was confusing. I used to run SE 1000w hps and my hoods were cooled. Totally different set up but I understand how to cool a conventional bulb. I now use vertical 315cmh with Hortilux bulbs. I do not air cool them(bulb is too long). I want to try this light and swap out two 315 cmh for this one LED to see what is all the hype is.
HLG 350R = 1125 BTU
@MidnightSun72
Where did you get the thermal output of the HLG 350? Does that include the ballast or do i have to add 400btu to the 1125btu for a total of 1525btu.
I do not use the hps anymore. The QB that HLG says a 3'x5' which i only care about the 3'. The lights are in linear sequence with appropriate overlap.
That has to be an error on the HLG site. Boatguy is quite correct, you want around 35 watts per square/foot. A 3x5 is 15 sq/ft. so 525w.
He calculated it, 1 watt = 3.412142 BTU. It makes no difference if it's CMH, LED or a vacuum cleaner.
So does the HLG 350 account for the ballast mounted to the top of the fixture?
Depends what driver you use. Whatever the efficiency of the driver is the rest of the percentage of the watts to to heat. So a driver that concerts 90% of 600w to dc power there will be 60W heat wasted. Or 60x3.41 btu = 204 btu
