Item24 has tslot profiles but its quite pricey. But at least its usually fairly local shipping.
Otherwise just use local aluminium shop. For this it can actually even be better to use the yellow papers or check where building and construction contractors get alu from.
G/w: nowadays a useless metric unless you add info on what footprint and conditions. Low watts per area equals higher g/w of fluffy buds that you could smoke allright but wouldnt buy. G/area or square foot is a more relevant metric. G/w was only usefull when everybody used a 1000w hps in a 4x4.
One of the lights i built for a friend, he pulled 350 g on 100w using autos in 80x80cm tent. After having some problems in his first grow (the light was speced to 300w which was way too much for his tent and 20 hour lights on and he had problems related to over lighting) he decided to try to see what he could do with minimum watts. Since the spectrum was very appropriate for this it worked out great but the buds did not look like dispo/smoke club quality, some fluffieness on bottoms and mids. In the end its about 2 ounce/50g per square foot which is ok per area but nothing to bragg about. So i think g/w is not so relevant anymore, unless youre at comercial facilities or being very near the max Amps you can draw on your power installation.
Maybe he could have gotten another 20 grams by upping to 150w, but then his g/w dropps to 2.4ish for another few $ in power consumption. This to me would still have been preferable, even though his g/w went down. 20g for a few euros? Id take that any day.
To compare his g/w nrs with 12/12 youd have to multiply them by 0.6 since 12h flower is 60% less total light than 20h. Now his numbers are even more reasonable.
Obviously he was exstatic though since he would always pull less with his previous 400w hps which many times couldnt be run at full power due to heat.
Otherwise just use local aluminium shop. For this it can actually even be better to use the yellow papers or check where building and construction contractors get alu from.
G/w: nowadays a useless metric unless you add info on what footprint and conditions. Low watts per area equals higher g/w of fluffy buds that you could smoke allright but wouldnt buy. G/area or square foot is a more relevant metric. G/w was only usefull when everybody used a 1000w hps in a 4x4.
One of the lights i built for a friend, he pulled 350 g on 100w using autos in 80x80cm tent. After having some problems in his first grow (the light was speced to 300w which was way too much for his tent and 20 hour lights on and he had problems related to over lighting) he decided to try to see what he could do with minimum watts. Since the spectrum was very appropriate for this it worked out great but the buds did not look like dispo/smoke club quality, some fluffieness on bottoms and mids. In the end its about 2 ounce/50g per square foot which is ok per area but nothing to bragg about. So i think g/w is not so relevant anymore, unless youre at comercial facilities or being very near the max Amps you can draw on your power installation.
Maybe he could have gotten another 20 grams by upping to 150w, but then his g/w dropps to 2.4ish for another few $ in power consumption. This to me would still have been preferable, even though his g/w went down. 20g for a few euros? Id take that any day.
To compare his g/w nrs with 12/12 youd have to multiply them by 0.6 since 12h flower is 60% less total light than 20h. Now his numbers are even more reasonable.
Obviously he was exstatic though since he would always pull less with his previous 400w hps which many times couldnt be run at full power due to heat.
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Dont beat me up 
18on 6off veg (do auto's need rest ... yes)
