Heat problems in a 40x40x120cm HPS / cfl

[Logon]

Hello!
I have large heat problems in my 40x40x120cm(15x15x47 inches) grow tent

I am currently running a 150w HPS and can't seem to keep the temperatures under 31c(87f) and have pretty much given up on keeping it cool as it is inside a wardrobe and i can't really vent the heat enough. I use a 86-110cfm inline fan with a carbonfilter and a small fan blowing directly at the lamp. If anyone has any tips on how to fix this put down a line.

I am considering changing to a big cfl instead and wanted to ask how much heat the 125w and 200w cfls puts out, i would prefer to switch to the 200w cfl ofcourse but i don't know how much heat either of these puts out, if i can't vent a 150w HPS can i vent a 125w/200w cfl?

Thanks hopefully someone can help me (excuse any bad spelling and grammatical errors!)

 

[frica]

In a closed box, you can assume that all the watt a light pulls becomes heat.
All of it. (Some gets used for photosynthesis, but it's a very small amount that's negligible in the big picture)
Also CFL is actually less efficient than HPS.

A 200W CFL would cause even bigger heat issues.

A 125W CFL causes less heat issues.



You could try to go the LED bulb route by building something like this.
And only using 100W in total.
Getting screws in wood is very easy and it's a lot more efficient.

 

[frica]

led bulbs with diffuser popped off. Diffuser on also works, but popping it off is generally better.

Also why can't I edit my posts?

 

[Hold Your Fire]

Hello!
I have large heat problems in my 40x40x120cm(15x15x47 inches) grow tent

I am currently running a 150w HPS and can't seem to keep the temperatures under 31c(87f) and have pretty much given up on keeping it cool as it is inside a wardrobe and i can't really vent the heat enough. I use a 86-110cfm inline fan with a carbonfilter and a small fan blowing directly at the lamp. If anyone has any tips on how to fix this put down a line.

I am considering changing to a big cfl instead and wanted to ask how much heat the 125w and 200w cfls puts out, i would prefer to switch to the 200w cfl ofcourse but i don't know how much heat either of these puts out, if i can't vent a 150w HPS can i vent a 125w/200w cfl?

Thanks hopefully someone can help me (excuse any bad spelling and grammatical errors!)

get a smaller watt hps bulb?

https://www.1000bulbs.com/product/4745/LU0100-368720.html

 

[Hold Your Fire]

That's roughly the same watts per sq ft as a 1000w hps in a 4x4 tent.

That works well for me.

 

[Hold Your Fire]

GE and Sylvania make a 70 watt with a mogul base

https://www.1000bulbs.com/category/70-watt-high-pressure-sodium-lamps/

 

[Flowdandada]

Hey!

0.4 x 0.4 = 0.16 m2
150/0.16 = 937.5w/m2

Over 900-1000w/m2, its hard to control the temperature if you don't have a proper setup.

I would recommend you to go down to around 600w/m2 and you will get much better temperature and its easy for you to control it.

Have you seen PPL? They are absolutely phenomenal. Low temperature, much light, you can have your plants really close to the lights and you can change spectrum.

Don't go with CFL

 

[starke]

In that size space off the shelf LEDs would be your best bet.

Frica: You have to have 50 posts before you can edit and do other things. See the forum guidelines.

 

[Logon]

GE and Sylvania make a 70 watt with a mogul base

https://www.1000bulbs.com/category/70-watt-high-pressure-sodium-lamps/

My socket is a e40 so i guess the e39 won't fit?

Hey!

0.4 x 0.4 = 0.16 m2
150/0.16 = 937.5w/m2

Over 900-1000w/m2, its hard to control the temperature if you don't have a proper setup.

I would recommend you to go down to around 600w/m2 and you will get much better temperature and its easy for you to control it.

Have you seen PPL? They are absolutely phenomenal. Low temperature, much light, you can have your plants really close to the lights and you can change spectrum.

Don't go with CFL

Yeah with that way of thinking i can see i really oversized the light for that tent.

Sorry for the ignorance what is PPL? I googled "PPL icmag" and couldn't really find anything

In that size space off the shelf LEDs would be your best bet.

Frica: You have to have 50 posts before you can edit and do other things. See the forum guidelines.

Yeah it seems like LED is the best, and cooling fans on the LED blow UP which is where i extract the air so that would make the fan more efficient aswell.

Which LED do you guys suggest? Are china LEDs "good enough" yet? Would be nice to be able to buy a cheaper LED to see if it even works heat wise, a 300w china pulls like 100w from the wall so should be much less heat development from that.

 

[frica]

My socket is a e40 so i guess the e39 won't fit?

Yeah it seems like LED is the best, and cooling fans on the LED blow UP which is where i extract the air so that would make the fan more efficient aswell.

Which LED do you guys suggest? Are china LEDs "good enough" yet? Would be nice to be able to buy a cheaper LED to see if it even works heat wise, a 300w china pulls like 100w from the wall so should be much less heat development from that.

An e39 socket will fit in an e40, just like an e26 will fit in an e27.
They're close enough that it doesn't matter.

Generic 100W equivalent bulbs you can buy at homedepot are more efficient than those Chinese Ebay leds.

 

[Logon]

Seems like the cheapest way to see if i can fix this is to buy the 70w HPS it seems

The more known brands are at 1900 kelvin is there a big difference between 1900k and 2000k?

 

[frica]

Seems like the cheapest way to see if i can fix this is to buy the 70w HPS it seems

The more known brands are at 1900 kelvin is there a big difference between 1900k and 2000k?

Very small difference, 1900K is slightly more reddish.

Doesn't really matter.

 

[Logon]

You could try to go the LED bulb route by building something like this.
And only using 100W in total.
Getting screws in wood is very easy and it's a lot more efficient.

But that can't be 100w?
What is the wattage of those lamps? 6w each?

 

[frica]

But that can't be 100w?
What is the wattage of those lamps? 6w each?

In the pic are probably 10W.

13-14 watt philips LED lamps exist though and those are very efficient.
8 of those is 104W+.


If you're in Europe there are also 20W Osram parathoms...


More expensive than the 70W HPS though, but will give a higher yield per watt.

 

[webecat]

Since you already have the 150 I would try a DIY cool tube. I did it with my 150 and that was the end of my heat problems. I just used a 80mm fan and it dropped my temps about 15f or so. Before you do a 70w HPS consider LED's, they have come a long way and that is the route I will go someday.I like frica's set up, Blynx has a thread on it in micro grows like his and has had excellent results. I'm just not ready to bag my my 150 up yet though, not yet anyway. Here is a link to the LINK-O-RAMA, there are a ton of DIY's in here, including some different cool tubes. https://www.icmag.com/ic/showthread.php?t=40637.

Good luck

 

[HuffnPufferfish]

pll phillips something, hard to get, harder to get drivers for but grow fine

 

[Samuel Caldwell]

Ventilation is the key to heat management. My previous setup was a 400 watt hps in a 2'x2' cab and it worked fine. I moved recently so had to start over. I switched over to LEDs in a small tent after seeing the results that others were getting. Much easier to work with than the hot old hps!

Check out the following thread if you haven't already seen it. Tons of great info.

Off the shelf retail store screw-in LED and CFL bulb comparisons

 

[Jonnysact]

Heat was the main reason I switched to LED. Haven't looked back since. I'm using a 270W UFO led that was around $150 on amazon. Been working strong and giving me great results!