Lighting HPS: 400W at 27°C vs. 600W at 32°C

[Kosbrand]

Hello

First grow here. My girls are approaching 5 weeks now, under 400W HPS. The day temperatures have ranged from 24 - 27°C (75 - 80 °F), which is already a bit warm.
Now I want to take my lighting to full power at 600W. The downside is the temperature rockets to 30-32°C (86 - 89 °F).
I read everywhere that lights equals yields, but is it worth it if the temperature goes up too much?

I have no possibility to exhaust my fans to somehwere else.

What would you go for?

 

[Death The Cultivator]

Hello

First grow here. My girls are approaching 5 weeks now, under 400W HPS. The day temperatures have ranged from 24 - 27°C (75 - 80 °F), which is already a bit warm.
Now I want to take my lighting to full power at 600W. The downside is the temperature rockets to 30-32°C (86 - 89 °F).
I read everywhere that lights equals yields, but is it worth it if the temperature goes up too much?

I have no possibility to exhaust my fans to somehwere else.

What would you go for?

77-82f is where I keep my leaf surface temperature with an infrared thermometer gun. My ambient runs around 82-86f. I would check the leaf surface temp if you can otherwise that heat is going to be too high especially if your air flow is lacking and your humidity isn't sitting around 60%.

You might have to stick with 400 watts which is everything goes well could yield well. My only other advice would be LEDs and better ventilation on your next grow

CobsCocoDTWMxPScrog Watch Me Mess Up

 

[Kosbrand]

Some more details about CO², humidity and temperature since last night when I turned it to 600W, see screenshot.

As you can see during the night (plant day time), the temperature steadily rose from 28°C (82°F) to 31°C (88°F). I think this is ambient temperature, not sure, it is a netatmo wheather station where the air comes flowing in for measurements.

Humidity is around 65%.

CO2 around 800-1000.

Now when the door to the room is open the temperatures are better around 27°C (81°F).

Too bad I don't have a temperature gun for leaf measurements.

 

[Trichome farmer]

Some more details about CO², humidity and temperature since last night when I turned it to 600W, see screenshot.

As you can see during the night (plant day time), the temperature steadily rose from 28°C (82°F) to 31°C (88°F). I think this is ambient temperature, not sure, it is a netatmo wheather station where the air comes flowing in for measurements.

Humidity is around 65%.

CO2 around 800-1000.

Now when the door to the room is open the temperatures are better around 27°C (81°F).

Too bad I don't have a temperature gun for leaf measurements.

like the guy above says led will ring it down some depends on the led 31 is a bit hot but your pllants will survive it but the smells and tastes might be affected i been told terpenes begin to evaporate around 25 another option is get a cool tube and even if its venting into the room it will get rid pf alot of the direct heat from the bulb best of luck mate

 

[Death The Cultivator]

Some more details about CO², humidity and temperature since last night when I turned it to 600W, see screenshot.

As you can see during the night (plant day time), the temperature steadily rose from 28°C (82°F) to 31°C (88°F). I think this is ambient temperature, not sure, it is a netatmo wheather station where the air comes flowing in for measurements.

Humidity is around 65%.

CO2 around 800-1000.

Now when the door to the room is open the temperatures are better around 27°C (81°F).

Too bad I don't have a temperature gun for leaf measurements.

If your air flow is good, I'm sure that's ambient temperature btw, 88f with 800-1000ppm is honestly probably fine. Cannabis enjoys higher temps with higher c02 levels so if your air flow is good then your leaves are probably sitting 4 degrees lower, maybe not the ones directly under the light but I think 600w would be fine for your conditions

CobsCocoDTWMxPScrog Watch Me Mess Up

 

[Kosbrand]

Very useful info @Damien50

I'm seriously doubting to go for led though, considering the electrical costs and that the heat will only get worse the coming months..

Sent from my F5121 using Tapatalk

 

[Death The Cultivator]

Very useful info @Damien50

I'm seriously doubting to go for led though, considering the electrical costs and that the heat will only get worse the coming months..

Sent from my F5121 using Tapatalk

I'm running 12 bridgelux EBb 44" 3000k strips at 480w and I don't know if it's the strain but it's growing faster and better than any of my autos have. I'm happy with the switch despite the cost but I don't have to buy bulbs or deal with excessive heat. I have to have a heater when it's cold because the LEDS won't put out enough heat.

CobsCocoDTWMxPScrog Watch Me Mess Up

 

[Kosbrand]

I decided to go for cobs, and have made the purchase of 3x 100W Migro

https://www.migrolight.com/product/migro-300/

Will continue this grow with the HPS and use the migro 300 in the next.

Thanks for all the advice!