**ULTIMATE LED TEST** *GLH Spectra 290* VS *Blackstar 500* VS *Hydro Grow LED 336X*

WeJuana

Active Member
I was expecting these panels would hit the 2 oz per plant mark before you ran into issues. I totally suspect the deficiencies were the main culprits here so I wouldn't be worrying about the lights being bad. I honestly wasnt sure what kind of yield you were going to get after that went down, but your results are still good. Lowering the lights will likely help too. I'm sure your next round will be on par with my expectations for these lights.

The last strain I did 2 oz per with was snow dream (journaled here in riu), it's a cross of snow white x blue dream. I usually do 2 plants under the 180, anymore and I have to do smaller plants or my yields decrease. Two seems to be the right number, I veg for a week or two til clones are about 20 inches tall then flip.

Nice! Ya, I am excited to see how round 2 differs with the correcting of nutes and a few new factors that changed:

Instead of 3 gallon plastic pots, round 2 is in 5 gal smart pots.
Lights are now 50" from floor instead of 55"

Today is day 7 of round 2.. I'll get some pics up shortly!
 

WeJuana

Active Member
Right on Max!

I went to go snag a nug out of a jar.. and wham.. skunk! I think yall would be real proud of me if you had smelevision!
 

maxpesh

Active Member
Hey guys just made another leap forward in Led development. The theory about UV having an influence on resin production is just a theory only, and a bad one at that, I've just proved it using a child's gimmick toy, so putting UV led's in fixtures is a waste of time.
 

stak

Well-Known Member
Hey guys just made another leap forward in Led development. The theory about UV having an influence on resin production is just a theory only, and a bad one at that, I've just proved it using a child's gimmick toy, so putting UV led's in fixtures is a waste of time.
is this a joke or are you being serious?
 

maxpesh

Active Member
is this a joke or are you being serious?
Sorry, but no joke ! Even all the REAL research teams will tell you that it was never proven, but here we go again with all the led companies just using advertising gimmicks to sell stuff that isn't proven and because we all have human desires to have something good that hopefully works great, we believe them. Prove it yourself if you want to see it with your own eyes. Go to any Chemist and buy those children's UV detector bracelets that the kids wear on holiday to go in the Sun. Now bear in mind that LED lights do produce more resin than traditional HPS bulbs that put out a lot of UV. Now place the bracelet in the Sun and you'll see it change colour and then place it about 12 inches away from something like a Blackstar or Penetrator or any of the LED fixtures with a couple of UV bulbs on them. You will be amazed that there is no change in the colour of the bracelet unless you put it right up to the UV bulb itself, so the plants are getting virtually NO uv at all, and yet still produce resin. So it's a waste of time ;-)
 

Endur0xX

Well-Known Member
I have a UVB reptile lamp, it's not built for the reptile to be right against the bulb... So I am pretty confident that it gives plenty of UV ray even 1.5meters away... A LOT of people on RIU are having amazing result with UVB lamp... perhaps the one used in LEDs are weaker?

I think that what your experiment shows is basically that the blackstar UVB are shitte , not that UVB are inefficient on marijuana...
 

puffenuff

Well-Known Member
I'm not buying into max's theory either. uvb reptile bulbs like endur0 said have been increasing resin production. Also remember that strains native to high altitudes tend to have higher thc and resin levels and what do high altitudes have greater exposure to? Uv rays.

I'm not familiar with these bracelets or how they work but there could be a number of things at play here...it could be that the amount of uv light from the panel you tested isnt enough to cause a reaction in the bracelet...it could be that the panel you tested doesn't even have uv...it could be that those bracelets only work for uvb and uvc and your panel has uva...it could be that the bracelets only work in natural sunlight...it could be many things...i think that there still needs to be a lot more science and experimenting going into your claims, especially for someone attempting to break into the led market.
 

puffenuff

Well-Known Member
I'm not buying into max's theory either. uvb reptile bulbs like endur0 said have been increasing resin production. Also remember that strains native to high altitudes tend to have higher thc and resin levels and what do high altitudes have greater exposure to? Uv rays.

I'm not familiar with these bracelets or how they work but there could be a number of things at play here...it could be that the amount of uv light from the panel you tested isnt enough to cause a reaction in the bracelet...it could be that the panel you tested doesn't even have uv...it could be that those bracelets only work for uvb and uvc and your panel has uva...it could be that the bracelets only work in natural sunlight...it could be many things...i think that there still needs to be a lot more science and experimenting going into your claims, especially for someone attempting to break into the led market.
Nugs look tasty, WeJuana, wish I had smellovision or my monitor was scratch n sniff!
 

maxpesh

Active Member
I'm not buying into max's theory either. uvb reptile bulbs like endur0 said have been increasing resin production. Also remember that strains native to high altitudes tend to have higher thc and resin levels and what do high altitudes have greater exposure to? Uv rays.

I'm not familiar with these bracelets or how they work but there could be a number of things at play here...it could be that the amount of uv light from the panel you tested isnt enough to cause a reaction in the bracelet...it could be that the panel you tested doesn't even have uv...it could be that those bracelets only work for uvb and uvc and your panel has uva...it could be that the bracelets only work in natural sunlight...it could be many things...i think that there still needs to be a lot more science and experimenting going into your claims, especially for someone attempting to break into the led market.
Oh trust me I was taken aback too ! I'm not asking anyone to buy into this theory, just try it for yourself. don't forget it was never proven either, it was just a theory. I think the one thing that UV is good for is mould and certain bugs, so it does have uses. But this is all about education, separating the advertising from the reality, that's all I am trying to do ;-)
 

supchaka

Well-Known Member
I have one of those 100 watt reptile bulbs, those fuckers get hot, intentionally. I briefly thought about trying to put it in my cab and there's just no room as well as not wanting to deal with the extra heat.
 

johny1212

Active Member
UV does produce more resin. Just check out anyone running CMH bulbs or dual arc hps/mh bulbs. Spectrum is key here not lumens. That is why LEDs are are so efficient.
 

maxpesh

Active Member
UV does produce more resin. Just check out anyone running CMH bulbs or dual arc hps/mh bulbs. Spectrum is key here not lumens. That is why LEDs are are so efficient.
I have a new Philips CMH bulb and used it for one bloom cycle, the website was supposed to be doing a grow journal, 2 of them against 1 x 1000watt hps 2 years ago and it never happened, then they suddenly started giving away an hps for every CMH bought,,I wonder why ? Anyway my 600watt Philips greenpower blew it out of the water. Yes the CMH was only 400watts but the hype about spectrum was stating that it was the next big thing, not a little fizzle. So IF, UV produces so much resin and the UV emitted from LED fixtures is so small, why do led's produce a good amount of resin anyway. Not arguing any points. I just like proof and results :-)

Sorry if I sound like a tech head or a pain in the arse, but here is just 1 great example of why I know most led companies have done nearly zero research and just went along with the flow . http://www.photobiology.info/Gorton.html If anyone can be bothered to read for half an hour, I promise you'll be a bit wiser than before you started reading this article :-) Peace all
 

organicbynature

Active Member
So IF, UV produces so much resin and the UV emitted from LED fixtures is so small, why do led's produce a good amount of resin anyway. Not arguing any points. I just like proof and results :-)
I don't have a reference on hand, but Prof from the LEDs Without LEDs thread has stated that actinics (~420nm blue light) also promote resin production - there is little blue in HPS, especially around this wavelength.

I'm not sure if that's the answer or if there are other factors as well, but I'll throw it out there.
 
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