Someone help! Are 3 x 600w hps lights too much for a 2.4m x 2.4m x 2m grow tent?

I recently bought a 2.4m x 2.4m x 2m grow tent kit which come with 4 x 600w hps light now i believe that using all 4 lights in that kind of space will create way too much heat and probably give more than sufficent light?? I plan on doing 18 plants and i am already finding it difficult to keep the temp at an optimal level, i am using digital ballast so can drop the wattage down to 450 which i dont know if it would be a good idea? Sorry for the stupid questions im not very experienced any help would be greatly appreciated!!!

id say two maybe three in flower, 4 sounds a bit much to me.
Whats the tent temps?

So far i havent planted just waiting to get everytbing right but i ran the tent for just over 20mins and it was hitting past 30celcius which is basically 86f+ and thats too hot... so not sure what to do with temp control wether to get an ac? I have good ventilation and 2 6inch fans blowing air round the tent but i just want to make sure my 18plants will get enough light? I am using digigtal ballast too so can crank down to 450 watt if that would help? Im stuckk

Btw i had the thermostat on the floor of the tent under the lights so not sure if that was the best place to put it to get a reading

NoviceKing said:

Btw i had the thermostat on the floor of the tent under the lights so not sure if that was the best place to put it to get a reading

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Best thing you could do is start youtubing cannabis grows and pay attention to the fine details like what kind of equipment they use, where its located in the room, and lots more ideas

Good luck

Are you using an extraction fan and a passive intake? If so can you make the passive intake larger and /or increase the exhaust fan and still keep neg pressure?

NoviceKing said:

Btw i had the thermostat on the floor of the tent under the lights so not sure if that was the best place to put it to get a reading

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No wrong place, its now reading the air temps plus the light radiation.

Ive done a few threads on where and how to place your thermometer, its quite oftemn a mistake leading to high heat readings that simply arent the correct air temps.

For futher reading and knowledge google 'ambient temps mariijuana' as many have written the same info as me.

Hps be shit hot if you stand under it but so is the sun during summer, none of this is air temperature, go stand in the shade to feel that.

Hope ive helped and other newbies who wonder why they are working overtime to keep cool. Light barely heats air

3-600's would not be quite enough for nearly 64sqft. 4 would be just right though.

I use 4x600 in that space in a tent, parabolic shades , plenty of extraction, passive intake .....golden .

projectinfo said:

Best thing you could do is start youtubing cannabis grows and pay attention to the fine details like what kind of equipment they use, where its located in the room, and lots more ideas

Good luck

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Thanks budd, thats what exaclty what i have been doing think pretty much watched about every relevant vid on there now lol and have done plenty research

Lucky Luke said:

Are you using an extraction fan and a passive intake? If so can you make the passive intake larger and /or increase the exhaust fan and still keep neg pressure?

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Dont have a passive intake set up currently i am using a mix flow fan connected to my filter in the grow room and the duct going straight to a whole ive cut out in a bit of plywood that sits over the window and lets all the hot air seep out, for co2 i was going to use mush bags??

Kingrow1 said:

No wrong place, its now reading the air temps plus the light radiation.

Ive done a few threads on where and how to place your thermometer, its quite oftemn a mistake leading to high heat readings that simply arent the correct air temps.

For futher reading and knowledge google 'ambient temps mariijuana' as many have written the same info as me.

Hps be shit hot if you stand under it but so is the sun during summer, none of this is air temperature, go stand in the shade to feel that.

Hope ive helped and other newbies who wonder why they are working overtime to keep cool. Light barely heats air

Click to expand...

Pleased to here that my reading may be inacurrate, hopefully it is lower than what i think! Thanks for the advice i will check it out now! And so its all about the air temp then not the exact temp its getting from under the light if that makes sense? Sorry if i sound stupid im not that experienced as ive said but appreciate the advice!

Stink Bug said:

3-600's would not be quite enough for nearly 64sqft. 4 would be just right though.

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Well thats what comes with the grow kit so surely it must be suited for it, but someone told me it would be too much and i am planing on doing only 18plants so thought 3 600watters would do the job also i would save couple buck on ellecy bill and be easier to maintain the temp??

bazoomer said:

I use 4x600 in that space in a tent, parabolic shades , plenty of extraction, passive intake .....golden .

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Good to know that its possible i mean it must be if thats how the kit is sold yet i have been told of a few people that it would be to much, how many plants do you have in that space?

^^^^^^ 24

NoviceKing said:

Pleased to here that my reading may be inacurrate, hopefully it is lower than what i think! Thanks for the advice i will check it out now! And so its all about the air temp then not the exact temp its getting from under the light if that makes sense? Sorry if i sound stupid im not that experienced as ive said but appreciate the advice!

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No promises but yes your thermometer only wants to read air temps not light radiation. You can move your thermometer round to find better positions to read off.

As this early stage its just somthing to work towards and will help you understand the science of growing indoors.

It is written in many other threads and we use the word 'ambient' to describe the air temperature and not the added Light.

Kingrow1 said:

No promises but yes your thermometer only wants to read air temps not light radiation. You can move your thermometer round to find better positions to read off.

As this early stage its just somthing to work towards and will help you understand the science of growing indoors.

It is written in many other threads and we use the word 'ambient' to describe the air temperature and not the added Light.

Click to expand...

Yeah ive been looking into ambient temps since, im just still a little confused if its getting a high reading under the light then will the plant not feel the same temp? im going to hang it around the tent see what readings i get but i dont have an intake set up only extractor so not sure if it will be possible to keep the temp low enough without it and was going to supplement the grow room with co2 to make uo for it?? Head has been done in last week trying to put it all togeth, the set up is up, i have all equipment inc nutes and grow bags + medium etc im just wanting wverything to be right before i set the seeds away... i have out a lot of money into this and cant afford any mistakes! I have just signed up to this forum the other day and wish i had done it earlier as its great and been getting plenty of advise so thankyou to eveyone

Once you account for pot height and light distance from canopy, that can lose you close to a meter height. Top them at-least once during veg to control height/stretch a little. Once topped, as a rough guide don't veg bigger than 2.5 foot from bottom of pot to top of plant. It's better to have them on the verge of too small than running out of head space and frying tops. You can increase the veg height once you know what to expect, but remember every strain is different.

Also make sure you get your light distance right to avoid stretchy plants. I can't tell you how far as it depends on your hood type. Younger plants can take higher intensity sooner than you may think, so try to avoid early veg stretch.

NoviceKing said:

Yeah ive been looking into ambient temps since, im just still a little confused if its getting a high reading under the light then will the plant not feel the same temp?

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Nah bro, hardcore biology coming at ya from the boys in da grow tent......

Leaves can get very hot from radiant light heat, s'why transpiration is HIGHLY efficient at transfering heat energy in water out of the leaf and has very little to do with the air temps you are trying to measure.

Straight up some newbies think the light radiation is the actual air temps, big fail wrong noNO...! I teach the real deal, air is not really warmed directly by light.

Learn science or ignore the broscience here and align yourself with some real growers, i could make my thermometer pass 50 degreeeeeeeees to the mother fukin 'C' if i place it close enough.

Stay in school kids

I hope that didnt sound all offensive, im down with the hard science and can give exacting principles to any tent to help you set up and dial in the environment