light help please!

[wietlover]

I am slowly putting together my grow cab(you can find it in the construction section) , but have a issue with lighting. My cab dimensions are 140cms tall x 40cms deep x 60cms wide. I was planning on running 400watt hps/mh conv with a 125mm cool tube with a 125mm inline fan keeping it cool.(plus a centrifugul fan for the carbon filter)

But this may give me temp issues with such a small space and may have to drop it down to a 250 watt, obviously impacting yield!!! Is there anybody running a 400 watt in similar dimensions out there?? or am i asking for trouble if i put a 400watter in there???? Any help would be appreciated wiet

[resinate]

looking at the info on the lighting calculator I wouldnt be going a 400w

 

 

 

 

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Your room is 2.6 squarefeet, please review the three levels of recommendation bellow suited to your grow room

 

 

Minimum Lighting 25 watts Per Square Foot

 

Lighting

The minimum recommended lighting for your area is 65 watts

Ventilation

The minimum flow rating of your fan should be 9.9 Cubic Feet per Minute (CFM)

Power Requirements

This setup will require 0.4 amps to be available at all times for safest operation*

Optimum Lighting 40 watts Per Square Foot

 

Lighting

The optimum reccomended lighting for your area is 104 watts

Ventilation

For optimum ventilation the flow rating of your fan should be around 10.9 Cubic Feet per Minute

Power Requirements

This setup will require 0.6 amps to be available at all times for safest operation*

Maximum Lighting 60 watts Per Square Foot

 

Lighting

The maximum reccomended lighting for your area is 156 watts

Ventilation

Going this way you will require a fan with a flow rating of at least 12.9 Cubic Feet per Minute

Power Requirements

This setup will require 0.8 amps to be available at all times for safest operation*

Additional Comments

Getting to these points and or over it is highly reccomended the grower use Co2 in their room as your plants will only be able to photosythesise a certain amount of light before needing a Co2 boost to benifit

Edited August 17, 2010 by resin8

[wietlover]

Cheers resin8! I had already used the grow room calculator!!!Its all good i just have to bite the bullet and get the 250watter, don't want to burn the place down hehe !!(and i get to save a little coin too!!) wiet

[buzzo]

For what it's worth my Fridge grow room is almost the same dimensions.

 

I have just purchased a 250 watt HPS . Haven't installed it yet. Currently using 310 watts of

FLuro so I will be interested to see the temp diff.

Will let you know

[brick]

I have a freezer roughly the same size. Started with a 400 and had to drop to a 250. (no cool tube) easier to control the temps. colas are not as dense as a 400 but the quality is as good.

[Spliffy-P]

Hey wietlover,

You're defo better off with the 250W but if you wanna make your sun brighter, use a daylight or Neutral daylight coloured globe instead of the cool one. the daylight ones ar 5000K+ and the cool ones are around the 4000K-4500K. K is kalvins and it's what light is measured in, this rating does not effect temp, but the higher the K the brighter th light!

I'm a Sparkie BTW!!

[MongyMan]

You can buy 150w HID lights. In an area that small a 250w light is going to get to hot imo

 

Peace MM

[buzzo]

Hey wietlover,

You're defo better off with the 250W but if you wanna make your sun brighter, use a daylight or Neutral daylight coloured globe instead of the cool one. the daylight ones ar 5000K+ and the cool ones are around the 4000K-4500K. K is kalvins and it's what light is measured in, this rating does not effect temp, but the higher the K the brighter th light!

I'm a Sparkie BTW!!

 

True for veg, but you want to be running 3000k or 2700k for flowering.

 

Kelvin. This "temperature" is not simply an arbitrary number, but is correlation with actual thermal temperature.

 

luminous flux, a measure of the power of light

 

It is widely recognised that 5000k to 6500K Fluro's for the vegging state, and 2700K to 3000K for Flowering.

Despite what people will tell you. Fluro lights will acheive to same flowing result as a HPS lamp.

The difference is the Lumen output of HPS per watt is much higher than the Lumen output per watt for fluro.

My 250 watt 2700K fluro produces around 16,000 lumens. whereas my 250 watt HPS lamp produces around 29,000 lumens.

A 150 watt HPS produces around 16000 Lumen's or about the same as a 250 watt Fluro.

 

 

 

I have 100 watts of fluro and 250 watt HPS in my fridge with 2 X 125mm axial fans and the ventilation is about right.

You certainly won't get away with just 1 X 125mm even with just the 250 watt hps.

You might be ok with just 1 X 150mm if it's rated at around 20 Cubic feet per minute.

Personally If I was building my fridge again I would go with one 200mm Axial fan.

Edited August 22, 2010 by buzzo