Does 400 watt HPS need ventilation?

blacktusk23

Member

• Apr 11, 2018

• #1

Hi there. I currently have a 5’ x2.5’x2.5’ tent with a 150 watt hps light with no ventilation other than the 2 duct ports open. I have the lights on 16hrs a day and the temp stays steady at 30 degrees Celsius. If I wanted to upgrade to a 400 watt how light, would I need to implement some kind of ventilation/fan system? I’m most concerned about heat and safety. Thanks!

 

lokie

Well-Known Member

• Apr 11, 2018

• #2

Think about it. A bulb more than 2x the
size is not going to make it snow in
that tent.

 

Lucky Luke

Well-Known Member

• Apr 11, 2018

• #3

The cost of an extraction fan will be made up for by healthier plants.

 

Dynamo626

Well-Known Member

• Apr 12, 2018

• #4

Even if the heat isnt a problem... More light= more photosynthesis= higher plant resperation=higher humidity.

 

onionslinger

Well-Known Member

• Apr 12, 2018

• #5

Yeah, what they said. Not only the heat but you need to swap out air to control humidity and o/co2 exchange..

 

Kingrow1

Well-Known Member

• Apr 12, 2018

• #6

onionslinger said:

Yeah, what they said. Not only the heat but you need to swap out air to control humidity and o/co2 exchange..

Click to expand...

As per science Co2 and humidity naturally move from an area of higher to lower pressure/concentration without extraction. This speaks volumes about why plants dont need wind as well

 

blacktusk23

Member

• Apr 12, 2018

• #7

Thank everyone! I appreciate the input. I think I will have to go with a inline fan

 

onionslinger

Well-Known Member

• Apr 12, 2018

• #8

Kingrow1 said:

As per science Co2 and humidity naturally move from an area of higher to lower pressure/concentration without extraction. This speaks volumes about why plants dont need wind as well

Click to expand...

In nature.. but in a sealed tent?

 

Kingrow1

Well-Known Member

• Apr 12, 2018

• #9

onionslinger said:

In nature.. but in a sealed tent?

Click to expand...

Whos running sealed tents? Mine has vents.

There are many sealed tent experiments online where co2 depletion is measured as a direct reference to photosynthesis and such.

In nature wind cooling of the leaf is called forced cooling, without wind the leaf will naturally warm and produce updrafts thus removing boundary layer conductance or humidity.


mMainly were not runnig true sealed tents, more an enclosure with vents.

 

Lucky Luke

Well-Known Member

• Apr 13, 2018

• #10

onionslinger said:

In nature.. but in a sealed tent?

Click to expand...

tent or not CO2 is heaver than o2.