How many watts do I need

[Cousin Bo]

2 lights would do it i think u gonna struggle to vent it fast enough in such a small space with 3 or 4 600 watt hps lights man are they adjustable power wise or?

I've always heard it was bad to dim HID bulbs. Supposedly it changes the spectrum and is harder on the bulb.

 

[meerkat67]

I've always heard it was bad to dim HID bulbs. Supposedly it changes the spectrum and is harder on the bulb.

That’s fair chat too. I’ll go grab some 400w hps.. then I’ll just dim the ballast back to 400w

 

[amneziaHaze]

where are you getting 28C.at the tops or bottom/ top of tent

 

[meerkat67]

where are you getting 28C.at the tops or bottom/ top of tent

have thermometer sitting at canopy level

 

[Billy the Mountain]

I’m growing in a 2x2x2 (metre) tent. Have 14 whit widow plants I’ll be growing, will 3x 600w hps grow lights be too much in this?

The PAR map for a single 600w HPS doesn't even cover a 4'x4' (1.5 m^2) very well.

Three in an 8' x 8' would be worse.

 

[meerkat67]

The PAR map for a single 600w HPS doesn't even cover a 4'x4' (1.5 m^2) very well.

Three in an 8' x 8' would be worse.

View attachment 5364460

interesting, if that’s the case. What would you recommend putting in there? For the most even coverage for 14 plants/watts. Could be open to LED options too.. could you recommend a HID option that would be best then LED 2mx2mx2m area.

 

[Fallguy111]

interesting, if that’s the case. What would you recommend putting in there? For the most even coverage for 14 plants/watts. Could be open to LED options too.. could you recommend a HID option that would be best then LED 2mx2mx2m area.

If you want the most even coverage I’d recommend bar style leds. I’m preferring quantum boards because I can keep them high and more room at light level for fans. But for more even ppfd my bar light nails it.

 

[amneziaHaze]

If you want the most even coverage I’d recommend bar style leds. I’m preferring quantum boards because I can keep them high and more room at light level for fans. But for more even ppfd my bar light nails it.

You can try a diy it can get a lot cheaper and its not that hard to make.some new leds can produce 3g/w now

 

[laddyd]

I'm thinking heat stress will cause some foxtailing.
I had a Gelato out in the garage in early summer, the temps were in the 28 to 30 range. It was still foxtailing when I chopped it at 13 weeks of flower.

 

[amneziaHaze]

With some co2 you should be be able to go to 35c in theory

 

[Billy the Mountain]

interesting, if that’s the case. What would you recommend putting in there? For the most even coverage for 14 plants/watts. Could be open to LED options too.. could you recommend a HID option that would be best then LED 2mx2mx2m area.

Unless you have a compelling need for heat instead of light, an LED fixture would be a far better choice than an HPS light.
Technology marches on.

 

[amneziaHaze]

Unless you have a compelling need for heat instead of light, an LED fixture would be a far better choice than an HPS light.
Technology marches on.

I would think thats the stuff he allready has nobody is buying new hps now

 

[meerkat67]

If you want the most even coverage I’d recommend bar style leds. I’m preferring quantum boards because I can keep them high and more room at light level for fans. But for more even ppfd my bar light nails it.

Can you post a photo of bar LED? I know next to nothing about them. Also, what watt of the equivalent would I need in that size tent to be sufficient?

 

[Fallguy111]

Can you post a photo of bar LED? I know next to nothing about them. Also, what watt of the equivalent would I need in that size tent to be sufficient?

 

[meerkat67]

View attachment 5364469

I can’t seem to find an LED that will cover 2mx2m.. all they seem to cover is 1.5m max… do you think I’ll need something else alongside this?

 

[Fallguy111]

I can’t seem to find an LED that will cover 2mx2m.. all they seem to cover is 1.5m max… do you think I’ll need something else alongside this?

There’s many bar style leds. I’d say you’re shooting for 1600watt to max out your tent. So 2 800’s. I’ve run (aglex) Chinese bars and hlg qb’s. Both great and I don’t really see much difference.

 

[conor c]

I've always heard it was bad to dim HID bulbs. Supposedly it changes the spectrum and is harder on the bulb.

Just means you replace the bulbs faster

 

[joesoap2013]

1 thing Ida wished was using a parabolic reflector with a 600w hps way sooner it defo upped my yield
But the weed under the smallishish reflector was quality sht
Always seemed the best weed grew directly under the reflector

 

[meerkat67]

There’s many bar style leds. I’d say you’re shooting for 1600watt to max out your tent. So 2 800’s. I’ve run (aglex) Chinese bars and hlg qb’s. Both great and I don’t really see much difference.

What ppfd should I be after at the canopy?

 

[amneziaHaze]

900-1500 depending on co2 levels