Par mapping the world

pirg420

pirg420

Well-Known Member
Hybridway said:
I used to go only 2 grows per bulb the first yr., then started going 3 (6-7mo).
It's nice to see an estimated light loss over that time. Deff need a used Hortri though.
Good to see mapping.
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Ya for sure need a used horti. Im searching around for a used gavita DE too.
 
ttystikk

ttystikk

Well-Known Member
CobKits said:
well yeah but were trying to get a handle on gross output, no? all cobs radiate at similar angles and directivity is left up to the user (reflectors and lenses with theor various angles, # of cobs in an array, mounting height, current, etc)

i see both sides. i understand how OP wants the measurements to be replicable but also i think you would agree reflective walls is more of a "real world" grow environment
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I respectfully disagree. It's real world for growing in a tent. Lots of people have grows too big for tents, therefore measurements in the open are more relevant.
 
ttystikk

ttystikk

Well-Known Member
pirg420 said:
I wanna do some par testing with active vs passive cooling, has there been a thread on this yet?

Im assuming the active cooling keeps the Tj/Tc much lower and is better for efficiency, but how much lower is the question
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I took this to the logical extreme with CXB3590 chips in water cooled modules made of extruded 3/16” square section aluminum, filled with chilled water flowing through them at about 60F. I'm pretty confident that my actual Tj was in the low 60s.

While the efficiency was marginally higher, the plants suffered because I couldn't keep the growing space warm enough!

I had huge problems with condensation as well- to the point where I fried some of the chips, lol
20160619_135711.jpg
In this pic, half the modules were shut down to allow the plants to harden off to the light. After this, I increased light intensity in the prebloom veg which eliminated the problem.
 
ttystikk

ttystikk

Well-Known Member
CobKits said:
Thats fine but just remember in free space its a referendum on optics as well so its erroneous to try to measure gross output while introducing other variables
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Point well taken. I deliberately used 80 degree lenses to take maximum advantage of optical effects. Since they were mounted vertically, it was also important to protect the chips from damage via overspray or rubbing my fat ass on them.
 
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