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it looks like these are going to be twice the price of the regular cobs anybody still interested?

li-cor par meter not a factor for me when these cobs have LM80s of 70K hours at high currents at 500 mA vs 1000 mA you cob is still going to be obsolete long before you notice a lumen maintenance difference capital investment vs payback time is a fundamental and has been discussed to death...

to get a true measure of shading and "penetration" ill make some checkerboard shades that take out 10%, 20% etc of the light and measure that way. this arbitrary my canopy vs your canopy is useless anecdotal data tbh will look at your data later its a little apples vs oranges tho.not sure of...

long read and i feel were on the same team but both taking extreme positions for the sake of argument but link this id like to see it, and ill respond ive got a 9-cob rig in a 3x3 tha ti can take some measurements with, an throw some boards in and do the same as one aside your breaking 300W...

i see +3.7% on a luminus cxm 22 going from 200 to 100 mA +4.1% on a cxb3590 its really diminishing returns to double the number of emitters for gains that low

there are reputable chips around that price by citizen, cree etc. they are just smaller les with less diodes. no need to buy the noname chinese junk that usually has wide flux ranges, low lumen maintenance, and unrelaible lifespan. for jsut a few more dollars. gen5 citi 1212s can be had for $8...

the cheap diy stuff you are posting is probably actually less efficient than both mars and viper 2.5 x 2.5 feet? no not enough light. that is not going to be very effcient at all youd need 3 of those to fill the space and they might only last a year or less at those high currents it doesnt...

im not trying to "sell" anything, just sharing information of the 100s of chips ive tested that all act similarly, its a curve so the percentage isnt the same, but +/-10% efficacy is typical im talking about testing actual chips on actual heatsinks in the typical current ranges we run, not in...

these are also a good investment at $2 each and you can plug the bulbs right into a powerstrip https://www.homedepot.com/p/Leviton-Outlet-to-Socket-Light-Plug-White-R52-00061-00W/100170446

do this 1. go to home depot. 2. walk past the overpriced 9W purple "full spectrum" bulbs 3. buy a 4 pack of 15W ("100W equivalent") daylight bulbs for $13.50 4. buy a 4 pack of soft white bulbs in the same size, $13.50 now you have 120 real watts of white light (aka full spectrum, for real)...

did you try searching? the effect on uptake and cal and mag with leds is dicussed all the time apart from supplementing with cal mag you can raise your temps to ensure good transpiration and uptake and the deficiencies will go away try to stay above 80 degree leaf temp

8-12% is more realistic when halving current

no logic in your post using the same diodes as somebody else in your design = expected using the same diodes in a board that is identical in layout and dimensions, and then you ripoff their brandname = completely different

what do you mean by "full spectrum"? thats often a marketing term and usually means the light is in fact, not "full spectrum"

as expected

it matters not as theres no plants there yes thats an advantage of strips, being able to get closer however being that close to any distributed light source will give you tremendous difference in par once your distance drops if you are 18" from your light source, going from 18 to 24" (6", 25%...

"quantum board" is a product of a specific vendor (Horticultural Lighting Group) what you link is just a copy of that do you trust a company that steals another's design and name to actually provide a quality product built with the parts they are claiming, or do you think they will cut every...

the de hps are 2.1, the de cmh ive seen are topping out around 1.8 (but watt for watt prob still give de hps a run for its money on spectrum alone) those are (new) bare bulb numbers of course. most DE HPSs throw down ~1.7 in a reflector once the bulb hits steady state, ao 1.4ish on the CMH probably

you cant have your cake and eat it too. in other words you cant write off the entire cost of your LED in the first grow thats like comparing growing weed to not growing at all. sure you can grow thousands of dollars of weed and cover the cost of a $1000 LED in the first grow. but you need to...

my par meter at 18" from a 9 cob array n a tent says otherwise, its very uniform. your case only holds water if people are growing right up to their cobs, which they arent in most cases. at appropriate distance there is zero difference between a cob rig and a board rig in "penetration" and...