What sort of heat will a 480w led throw out?

I live in a relatively cold damp climate. For most of the year temps are about 6-13°c 50-70% rh . Apart from.summer which has been exceptionally warm this year highs of 32° . But that's been brief it's already back down to 14° .

That said I know LEDs throw out less heat than say cfl. And I know with my very first grow inside a small bin using a 100 watt led instill could have problems keeping heat in especially at lights off . I started that grow during winter so i had to run my autos 24/7.

This time around I want to give the plants some rest, get some stretching between the nodes or just less compact , and save on the energy bill.

So

A) will a 480w ( not using full power though about 300w max) provide enough heat to a 120x120x200cm(4x4) grow tent . I will have an inline fan , potentially reducing to 50% , and one oscillating clip fan inside and either a passive intake or a diy setup using pc fans and duct tube. .

B) with lights off . Should I shut down all fans but the oscillating clip fan for the 6hours of darkness . Even with that. Concerned about temperatures dropping.

I don't use central heating and my apartment is around 16°c most of the year apart from winter months it's about 13°c.

Previous grows I've grow out of bins in cupboards and insulated heavily keeping the heat in until lights off . But had no fans running to achieve It.

So a few questions here

Will led throw of 300watt throw out enough heat while providing efficient CO2 exchange . Can I take it down a notch to keep the heat .

And what should and could I do for lights off to keep the heat in and potentially shutting down all fans but an oscillating one when lights off

A 480w LED will throw out 480w of heat. Dialing it down to 300w, it will throw out 300w of heat.

480w = 1638btu/h
300w = 1024 btu/h

You can use this tool for watts to btu/h conversion

I have some plants in an outdoor 4x4x7 metal shelter during the winter. It gets cold where I am, down to 0F on the coldest nights. I use a 1200w space heater to keep the plants alive. I adjust it to maintain at least 65F. If I were in your situation, I would use a similar space heater to add heat to whatever is your minimum allowed threshold. You could put the heater outside the tent plugged into an inkbird temp controller monitoring the inside temp.

it takes about 7000 btu to heat an average 300 sq foot area, about 1800 to heat a 1000 sq foot area, so your 480 watt light would produce enough heat to keep a 20 x 40 foot room pretty comfortable in a mild winter...it would take a large window ac, one that runs at 1500 btu, to counteract the light, keeping the temperature constant

I think you get about 3.5 btu's per watt.......ya better confirm.

Tracker did the math in post #2, it's correct.
1 watt = 3.41 BTU

you just have to have the area you're using well insulated. you'll want to vent some of the heat during the day cycle, but stop your exhaust fans maybe half an hour before lights out. i'd keep at least one fan running after the lights go off, but i'd have it blowing straight up, to keep the heat from all pooling up at the ceiling. you might need a small heater on a thermostat to keep it from dipping too low towards the end of lights out, but it shouldn't run too much before the lights kick back on and warm it up again

I struggled with temps when I made the switch from hps to led...I ended up throwing a cheap oil Radiator in the room hooked up to an inkbird thermostat...set the temp you want if it gets too cold the thermostat kicks in an turns the heater on, too hot turns the heater off..good bit of kit

During winter it's 8/10c in the tent area, to keep the tent 4x4 and 5x5 suitability warm and dry I need 660w+ of hid, it's not the cooling its the humidity that creates problems or expense.

Star Dog said:

During winter it's 8/10c in the tent area, to keep the tent 4x4 and 5x5 suitability warm and dry I need 660w+ of hid, it's not the cooling its the humidity that creates problems or expense.

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run a dehumidifier, as a plus, they produce a fair amount of heat, so you can keep it dry and warm with one unit

Roger A. Shrubber said:

run a dehumidifier, as a plus, they produce a fair amount of heat, so you can keep it dry and warm with one unit

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Yes I found the same, I've got a tube heater and a dehumidifier both are 160w or 180w? logic would suggest that the heater would give of more heat ffs its a heater after all... nope! it doesn't, the dehumidifier and tube heater give almost exactly the same heat to within a few 10ths of a degree but the dehumidifier also fights humidity whilst maintaining temperature.

It doesn't make sense to me I'm assuming it's to do with btu,s or something, meaning fk knows it's a mystery?

Star Dog said:

Yes I found the same, I've got a tube heater and a dehumidifier both are 160w or 180w? logic would suggest that the heater would give of more heat ffs its a heater after all... nope! it doesn't, the dehumidifier and tube heater give almost exactly the same heat to within a few 10ths of a degree but the dehumidifier also fights humidity whilst maintaining temperature.

It doesn't make sense to me I'm assuming it's to do with btu,s or something, meaning fk knows it's a mystery?

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No mystery, see posts #2 and #5. It makes no difference if it's a heater, refrigerator or TV, all electrical energy consumed is eventually converted to heat energy. BTU is a measure of heat energy and the conversion is 1 watt = 3.41 BTU as previously stated.

1212ham said:

No mystery, see posts #2 and #5. It makes no difference if it's a heater, refrigerator or TV, all electrical energy consumed is eventually converted to heat energy. BTU is a measure of heat energy and the conversion is 1 watt = 3.41 BTU as previously stated.

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I used led for my last crop and btu has become more apparent, 600w led gives out similar temps to 600w hps but in a different way.

To the uninitiated a heater should give out more heat than a cooling device lol.