Adam Rudland
New Member
Can some one please help? Are 2 600w hps and 1 400w hps enough light for 2m by 2’ by 2m grow tent?
2m by 2m grow tent lighting
- Thread starter Adam Rudland
- Start date
MedicinalMyA$$
Well-Known Member
My old standard from back in the day used to be 600W over 1m2, or 50-60W per sq. ft.
If you are only accessing the tent from one side I might opt for arranging your canopy and lights in a L-shape, leaving one square meter empty so you can reach your plants comfortably. If you put the 400 in the middle, the plants underneath it will receive some cross-lighting from two sides, helping even out the distribution a bit.
If you are only accessing the tent from one side I might opt for arranging your canopy and lights in a L-shape, leaving one square meter empty so you can reach your plants comfortably. If you put the 400 in the middle, the plants underneath it will receive some cross-lighting from two sides, helping even out the distribution a bit.
Adam Rudland
New Member
Adam Rudland
New Member
I want to run 3, 600w but temps abit high still being close to autumn! Should I still run them in an L shape when temps drop?
jimihendrix1
Well-Known Member
I generally use the same calculations as MedicalMyAss. I use the fact that a 600w HID is 66w sq/ft in a 3 x 3 area. Thats what Hortilux recommends for their 600w HPS bulb, which is the most powerful Single Ended HPS bulb made.
A 600w HPS ( I like Hortilux HPS Bulbs best ) in a 3 x 3 area is 66w sq/ft, and going by what manufacturers say this is the size area they are optimal at.
If used in a sq/m it will reduce the light down to 53.9w sq/m. Which is still good, but is about the minimum you want to use with HID. I think they say for optimal growth 52w sq/m is the lowest you want to go. Going from a 66w sq/ft to 53.9 is about a 20% reduction in light per sq/ft. A substantial amount IMHO.
A 1000w is good for a 4 x 4 area, and is 62.5w sq/m. Can they be used for a slightly larger area?? Yes but they will have to be raised higher, thus reducing light intensity, and probably not giving any better yield.
A meter is 39.37 inches vs a yard is 36 inches, or 3 feet. So a meter is 3 inches longer than a yard.
A square yard/3 x 3 area is 9 square feet, and a square meter is 11.3 sq/ft.
A 6ft x 6ft area would need 4 600w bulbs for maximum efficiency. Which is 66w sq/ft. Also a 600w HIS is about 3.5w more efficient than a 1000w HID. Soif you notice slightly conflicting light per sq/ft measurements, its because one may be for calculating the efficiency of a 600w HID vs a 1000w HID. But it will only vary slightly. 600w in a 3 x 3 is 66w sq/ft, and a 1000w HID in a 4 x 4 area is 62.5w sq/ft.
Umol per sq/ft would be a better measurement, but the watts per sq foot using the best HID bulbs is close enough.
For optimum amount of light you would need 4 x 600w HID lights to cover 36 sq/ft which is what 6 x 6 area is. . Preferably Hortilux HPS as they are the most efficient, and have the most umol.
Also for a 400w to be efficient, and use it with 2x 600w, the 400w would have to be much closer to the canopy. Which would interfere with the 600w light distribution fo overlap, if you are trying to use the 400w in the middle, and 600w on each side. The reflector would get in the way, or you could run it vertically, and no reflector...
But youre going to need some really good extraction fans, and reflectors to control even 2x 600s, and a 400w in a tent. And then your going to need some really good, constant fresh air flow/exchange.
I myself if I was to use the 2x 600w and the 400w, I would use an area of about 6ft 7 inches long, and x 3 feet wide or 20.3 sq/ft. The 400w is good for about 2.5 x 2.5 area. Using those 3 lights in a 20.3 sq/ft area would give you 78.8w sq/ft. Which is a huge amount, and exceeds what is optimally needed. and remember each light has a certain foot print that is set in stone, and cant be changed. It would be better if you had 84 inches, or 7 feet for length vs 78 inches. It may even be best to just use a 6 x 3 area, and just use the 2x 600w HID. To avoid excess light. With that much light you would need CO2 for optimum results. To use 1600w worth of light it would be optimal to have about 25 sq/ft, but the lights you have arent capable of producing the needed foot print. For optimally lighting your 2 meter x 2 meter tent which is 45.4 sq/ft you would need 2837.9 to get to 62.5w sq/ft watts. Or 36.3 sq/ft, and 2400w to get 66w sq/ft A 6 x 6 you would need 2250 watts to achieve 62.5w sq/m.
I myself would use the 2x 600w in a 6 x 3 area. and then work on proper ventilation, and air exchange, and heat exchange fan to pull the heat through ducting. You also need reflectors that will work with ducting. And also a way to vent the hot air out of the room the tent is in, or youll just be exchanging hot air.
A 600w HPS ( I like Hortilux HPS Bulbs best ) in a 3 x 3 area is 66w sq/ft, and going by what manufacturers say this is the size area they are optimal at.
If used in a sq/m it will reduce the light down to 53.9w sq/m. Which is still good, but is about the minimum you want to use with HID. I think they say for optimal growth 52w sq/m is the lowest you want to go. Going from a 66w sq/ft to 53.9 is about a 20% reduction in light per sq/ft. A substantial amount IMHO.
A 1000w is good for a 4 x 4 area, and is 62.5w sq/m. Can they be used for a slightly larger area?? Yes but they will have to be raised higher, thus reducing light intensity, and probably not giving any better yield.
A meter is 39.37 inches vs a yard is 36 inches, or 3 feet. So a meter is 3 inches longer than a yard.
A square yard/3 x 3 area is 9 square feet, and a square meter is 11.3 sq/ft.
A 6ft x 6ft area would need 4 600w bulbs for maximum efficiency. Which is 66w sq/ft. Also a 600w HIS is about 3.5w more efficient than a 1000w HID. Soif you notice slightly conflicting light per sq/ft measurements, its because one may be for calculating the efficiency of a 600w HID vs a 1000w HID. But it will only vary slightly. 600w in a 3 x 3 is 66w sq/ft, and a 1000w HID in a 4 x 4 area is 62.5w sq/ft.
Umol per sq/ft would be a better measurement, but the watts per sq foot using the best HID bulbs is close enough.
For optimum amount of light you would need 4 x 600w HID lights to cover 36 sq/ft which is what 6 x 6 area is. . Preferably Hortilux HPS as they are the most efficient, and have the most umol.
Also for a 400w to be efficient, and use it with 2x 600w, the 400w would have to be much closer to the canopy. Which would interfere with the 600w light distribution fo overlap, if you are trying to use the 400w in the middle, and 600w on each side. The reflector would get in the way, or you could run it vertically, and no reflector...
But youre going to need some really good extraction fans, and reflectors to control even 2x 600s, and a 400w in a tent. And then your going to need some really good, constant fresh air flow/exchange.
I myself if I was to use the 2x 600w and the 400w, I would use an area of about 6ft 7 inches long, and x 3 feet wide or 20.3 sq/ft. The 400w is good for about 2.5 x 2.5 area. Using those 3 lights in a 20.3 sq/ft area would give you 78.8w sq/ft. Which is a huge amount, and exceeds what is optimally needed. and remember each light has a certain foot print that is set in stone, and cant be changed. It would be better if you had 84 inches, or 7 feet for length vs 78 inches. It may even be best to just use a 6 x 3 area, and just use the 2x 600w HID. To avoid excess light. With that much light you would need CO2 for optimum results. To use 1600w worth of light it would be optimal to have about 25 sq/ft, but the lights you have arent capable of producing the needed foot print. For optimally lighting your 2 meter x 2 meter tent which is 45.4 sq/ft you would need 2837.9 to get to 62.5w sq/ft watts. Or 36.3 sq/ft, and 2400w to get 66w sq/ft A 6 x 6 you would need 2250 watts to achieve 62.5w sq/m.
I myself would use the 2x 600w in a 6 x 3 area. and then work on proper ventilation, and air exchange, and heat exchange fan to pull the heat through ducting. You also need reflectors that will work with ducting. And also a way to vent the hot air out of the room the tent is in, or youll just be exchanging hot air.
coreywebster
Well-Known Member
Then you need either more powerful fan for higher air exchange or air cooled hoods or both.
jimihendrix1
Well-Known Member
Both.
