help with light selection

[ray7]

hey guys,what is the perfect number of lights in a 1.5m*3m growroom?...was planing on using 3 or 4 600w hps or 2 1000w hps...will a 6"extractor fan with 4" intake fan be sufficient for ventilation?

 

[cozz]

hi, so many variables, ie how many plants? growing style, but off the bat 2x1000 would about do that, but id start by working out how many plants, then lights/reflectors air cooled or not? then fan size needed for your area including the extra for the lights,etc etc, if you google what size fan for grow room youll come across a lot of calculators you can enter your dimensions etc into,

 

[ray7]

i have changed my thinking a bit,hear this out...3.5m*3.5m grow room with 4 screens(1m*1m) for scrog each with its 600w hps light all connected,4" intake fan 240 cfm and also passive intake ,2 towerfans,6"extractor fan 400cfm ...any ideas or critism is welcome

 

[m4s73r]

Vertical Barebulb. one tent 8x8 with 4 600 watt lights hung vertically, no hoods, no ducting, one fan to suck all air out of room, 8" 740 cfm fan. filter on fan exhaust.

Save money on the hoods, ducting, and way higher yeilds then hooded flat grows.

 

[ray7]

i'll have reflectors n every thng bt wont be air cooled the fans should suffice...16 plants 4 in each screen

 

[m4s73r]

Your not air cooling the hoods?

 

[ray7]

Vertical Barebulb. one tent 8x8 with 4 600 watt lights hung vertically, no hoods, no ducting, one fan to suck all air out of room, 8" 740 cfm fan. filter on fan exhaust.

Save money on the hoods, ducting, and way higher yeilds then hooded flat grows.

so will it be enough? with 16 plants is passive intake an option?

 

[m4s73r]

Depends on your fan and the size of your intake ports. But if your not air cooling those hoods, you will proly always have heat issues with that much light in that size of space. Hoods retain heat. Which is fine in open warehouses. But in a little tent, that hood will become a huge 98dF heat sink.

 

[Cannasutraorganics]

That's 11.5 feet square. 4 1000 watt hoods. To help remove a bunch of heat and keep the lumens more even on the plants, use a super spreader under the light. It takes the hottest part and puts it back up in the hood and reflects it down more evenly over the rest. No hot spot in middle of hood and swapping plants around when they don't grow even. These act like heat sinks in stereos and remove a lot of heat. I run 4 1000 in a room 11.5x 10.5. No blower on hoods. I swap air from in the house and the house AC/heater controls the heat. I've ran 5 lights in a 14x11 room with a 12000 btu AC. Kept room at 80. Would drop to 65 if I wanted it too.

 

[ray7]

.

Depends on your fan and the size of your intake ports. But if your not air cooling those hoods, you will proly always have heat issues with that much light in that size of space. Hoods retain heat. Which is fine in open warehouses. But in a little tent, that hood will become a huge 98dF heat sink.

good to know...so wiith the same stepup but lights hanged vertically will be structurally safe? never done scrog so m looking for all the info i can get

 

[m4s73r]

Should be, a barebulb on a socket is much lighter then a hood. Yeah I dont do scrog, im a lazy grower.

 

[ray7]

That's 11.5 feet square. 4 1000 watt hoods. To help remove a bunch of heat and keep the lumens more even on the plants, use a super spreader under the light. It takes the hottest part and puts it back up in the hood and reflects it down more evenly over the rest. No hot spot in middle of hood and swapping plants around when they don't grow even. These act like heat sinks in stereos and remove a lot of heat. I run 4 1000 in a room 11.5x 10.5. No blower on hoods. I swap air from in the house and the house AC/heater controls the heat. I've ran 5 lights in a 14x11 room with a 12000 btu AC. Kept room at 80. Would drop to 65 if I wanted it too.

i have no ac in the room bt the fans should hold the fort,hoods i will definately use to maximise light usage and spread...

 

[ray7]

Should be, a barebulb on a socket is much lighter then a hood. Yeah I dont do scrog, im a lazy grower.

looking to maximise light output...too much weed bro !

 

[m4s73r]

Hoods block light, go check out the vertical forum. Thats how you maximize light output