Aircooled Hoods/Glass

Hellooo

Just been watching sublbc on Youtube, http://www.youtube.com/watch?v=pZUoLcvhatI&feature=feedu and he is of the opinion that the glass in air-cooled hoods interferes with the quality of light that the ladies receive.

Whats your thoughts on this please people?

I have a Magnum XXXL and am almost ready to start my first ever grow.

Thanks.

It's certainly true that a pane of glass will absorb some energy as light passes through it. Depending on the type of glass some light wavelengths will be partially or fully absorbed by the glass, particularly in the UV spectrum. Pure glass absorbs very little, while toughened glass may absorb more depending on what materials were added to the glass to toughen it. The glass used in reflectors is likely to be toughened in some way as thin panes of pure glass are quite fragile.

In many circumstances though the cooling advantages of having the pane of glass there will outweigh the disadvantages. If you can maintain cool temperatures in the grow space easily without the glass then leave it off. If however you need a draught of air to pass through the length of the reflector in order to keep the whole reflector cool (and thus help to keep the rest of your grow space cool) then there's no option but to leave the glass in, or to take extra cooling measures - more/bigger fans etc.

lens all the way. i hate heat

In general the glass is gonna eat 10-20% of your light output. But it is well worth it IMO

Yeah, I couldn't cool my tent without sealed hoods.

I can see the reflection of the bulb on the inside of the glass. Proof there is some resistance?

The reflection doesnt mean much really. I comes down to what quality of glass is used. If it is standard glass or tempered glass. How thick it is... I could keep going

For the amount of heat it keeps off the plants its totally worth losing a little light.

Mike@420 said:

For the amount of heat it keeps off the plants its totally worth losing a little light.

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Yes with the glass you can put the hood closer to the plants which is turn negates the fact that you lose light output

Even high transmittance glass will eat about 10% of the light. Standard annealed glass can eat up to 25% or more. But where heat is an issue, they're a must. If you are merely trying to get the lamp closer to the tops, you have to remember to take light spread into consideration. The closer you get to the plants, the smaller the coverage area you get. Each light in my grow had to cover at least 4'x4', so I could only get so close, or I lost coverage.

So what about if I went to a Glazier and got a proper piece of normal glass? Or what about perspex?

You are going to need to buy either quartz glass, fused silica, or specially non reflective glass to net any gains. Either way, it's gonna be expensive.

Jack Harer said:

You are going to need to buy either quartz glass, fused silica, or specially non reflective glass to net any gains. Either way, it's gonna be expensive.

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Listen to this man, he knows what he's talking about. I was going to say you'd have to get quartz glass, but he took it much further than I could have.

devk said:

I can see the reflection of the bulb on the inside of the glass. Proof there is some resistance?

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what kind of hood you got? some off brand dont use the right kind of glass and yes it does eat a lot of light

Wolverine97 said:

Listen to this man, he knows what he's talking about. I was going to say you'd have to get quartz glass, but he took it much further than I could have.

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Cool thanks, will do..

Grow mo said:

what kind of hood you got? some off brand dont use the right kind of glass and yes it does eat a lot of light

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Magnum XXXL

o dear, some people eh. lol

iNFID3L said:

o dear, some people eh. lol

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??? the hood or some of the comments??

the whole, is my glass making my plants suffer thing, i mean come on , ffs !
Next it'll be, when i flush the loo, it creates a vacuum through the house , as a consequence, my leaves are moving, how much damage is being caused? lol

iNFID3L said:

the whole, is my glass making my plants suffer thing, i mean come on , ffs !
Next it'll be, when i flush the loo, it creates a vacuum through the house , as a consequence, my leaves are moving, how much damage is being caused? lol

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Its my first grow, Im sure you asked searching questions when you first started INFID3L........

Peace.

iNFID3L said:

the whole, is my glass making my plants suffer thing, i mean come on , ffs !
Next it'll be, when i flush the loo, it creates a vacuum through the house , as a consequence, my leaves are moving, how much damage is being caused? lol

Click to expand...

Why do you have to be a dick to this guy? He asked if the glass would interfere with the light, and he got answers. He never asked if the glass would make them sick. If you wanna be a dick, I'm your target, I brought up the fact that he'd lose lumens. Are you one of those who gets into a thread with nothing constructive to contribute??