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Thanks all for the responses. I've been verifying the light for the past 3 weeks, as that was the most probable cause, and there is no problem :(

Thanks Tracker for the response. Seeds are Amnesia Trance - from a reputable source 3 seeds germinated at same time 1 soil, 2 hydro soil plant has buds and is 5 weeks from plucking this hydro was flipped before soil because of size difference The other hydro seed had issues in it's youth and had...

5 weeks since flip and no buds ???? Ph 5.5 - 6.2 Temps are in 80's F and humidity has been high too. Other seeds/plants from same order are doing fine. Is it a bad seed? Ruderalis plant? WTF ?? any insight would be great.

BTW: I took your advice Dave455 and got some some 670nm. (Cree doesn't have a 660nm XP-E2 though).

No reflectors/253W draw (4x3590)

12" - 16" for cbx3590's works for me:blsmoke:

Your COB's will reduce some stretch due to them being more powerful than the blurples. If they are really strong, the IR radiation (depending on closeness) adds to curb stretch. (Soil stretches less than Hydro) I would flip it :wink:

It will not effectively bloom at 6 foot from canopy. Not saying it won't bloom, but no where near potential. 18" to 24" as (VegasWinner stated) is where you should start from. Raise/lower as needed to cover floor footprint. Good luck :)

Lots of great designs folks. New pics of my latest upgrade/refinement. I swapped out my 54W of 2700 A19 LED's for a better tailored solution. 40W of XP-E2's@630nm (#1396)

They can be used for all stages. I add supplemental lights for skewing the kelvin ranges.

I love the Cree COB's @3500K !! Just do IT! :weed:

Cool, thanks for the clarification. :-D

I thought LUX meters weren't accurate for measuring LED's ??

nfhiggs & verticalgrow are great answers 8-). If you have dimmers, start at 26"-28" at 60% power and increase power as they grow. Without a dimmer, opt for a safer distance of 30".

Sounds good :-P. I have the same HLG driver powering my 3590 cxb's (3500K) and I used similar distances for vegging. HydoDan runs at 16" (above post). I ran at 22"-24" for VEG. idk about sprouts, I use flouro for my seedlings until 5th leaf set and topping, then move to tent with COB's at 24"...

I've only started growing 6 months ago and built a DIY Cob. I did lots of research in these forums and went with Cree CBX3590's @3500K. I started with (2) 3590's @ 100W for less than $200 and upgraded 1month later to (4) 3590's @240W driven @ 1750mA (fed by 240VAC). I only grow 2 plants at a...

I would love to get closer, but heat buildup is an issue. The 7.5 cubic feet of area between canopy and lights heats very quickly :eyesmoke:. Stronger exhausts/fans are need I guess.

I'm too noob to be creditable - I have 250W of Cree CBX3590's @3500K and veg at 22"-24" & 16"-18" for bloom. I run at 100% unless I cant control heat, then I dim. Seems to work for my environment. Anyone have experience running these COB's closer?

Back again for round two. Learned a lot first time round. My PEX came out great, but light on yield due to problems with containers being too small and transplanting 3 times :roll:. The Widow was horrible due to PH issues. Growing two different strains at once using same nutes/PH turned out...

Looks good. Here is a pic of a girl @ 3 weeks bloom