What Wattage HPS ? Light Penetration Explained via Inverse Square Law

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DocGreenThumb

Well-Known Member
Flo Grow said:
True, but still, the particular HPS is still governed by the Inverse Square Law which is about the depth of light penetration.
Different shaped hoods are mainly for the footprint/covered area to be lit, but not so much depth of penetration.
A certain light can only shine so deep.
A particular hood, if able to cast light over a larger area is giving off less light and lumens around the edges really.
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Very informative thread Flo. What size reflector would be good to light my 4.6' x 5.7' with a 600 HPS?

I want the largest foot print with minimal lumen loss for light to travel across the hood also it will be an air cooled hood to keep the light as low as possible.
 
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farmboss

Well-Known Member
your rational is no more 'scientific' than saying if you only had 1 gallon a day to water plants, you'd have less water per plant with 20 plants versus 2.

try growing a single plant 1 foot from a 600 watt hps without a glass lens.
 
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DocGreenThumb

Well-Known Member
IDK about that, my light is 8-10" away with the glass lens and a 434cfm about 1/2 strength pulling air through the hood and a 35lb carbon filter. I just cleaned the lens and bulb and it is so much brighter. I'm a lazy stoner and need to get on my cleaning better in the garden.

You must spread some Reputation around before giving it to Flo Grow again.
 
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Jason2011

Active Member
have you tried your local sheet metal workshop?
just go in and tell them what you want. im in australia and got 4 made up for 12.50 each
i also believe you might have some luck in a shop that does fire places, i think flue sizes are similar to fan dia. but might cost more i think they made from stainless steel, mine are made of light guage zincalume
 
Flo Grow

Flo Grow

Well-Known Member
farmboss said:
your rational is no more 'scientific' than saying if you only had 1 gallon a day to water plants, you'd have less water per plant with 20 plants versus 2.

try growing a single plant 1 foot from a 600 watt hps without a glass lens.
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Sorry I don't drop in the way I should since I started this thread !
For future ref, pm me if i take to long to respond.

Now, I have that in many grows, IN PERSON.
If you can't get your 600w that close, you have other environmental problems to solve.
EVERYTHING must be in order for it ALL to come together just right !!!!!!!
 
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