Fluence LED's shorten flower cycle

Hmm! If this are really 1w diodes my 50w/2$ chips(10x 10) are actually 100w chips, lol?!
Unfortunately you will not find a datasheet but maybe you can get a spheere test when you ask one of the alibaba resellers.
I found only the old pictures to the full spectrum COB's(1540°k), which were already used with gen.1. If there were no changes in the phosphor mixture, they still apply. But I do not have gen.1 chips to compare it.

I do not want to disappoint you, but lux-meters have a green filter to calibrate them for human response. Unfortunately, you can not use it for these COB's. But there is a how-to somewhere that shows how to turn a lux meter into a PAR meter(youtube I believe).
Or build a cardboard spectrometer, I attach you the instructions for printing below.
Print it 1: 1 and the spectrum pictures you shoot with your smartphone cam can you read out the specified website.
It's not a PAR meter but interesting and cheap.

I've thought about building a spectrometer similar to that one.

Thanks for the knowledge That does appear to be the spectrum they are claiming. Though I think, and I hope that my red:blue ratio isn't really 70% red / 25% blue. From my simple understanding this ratio may produce undesirable characteristics and a smaller yield.

As for the LUX readings, I figured since it was trying to measure and weigh part of the spectrum that wasn't there the readings should be low and my actual luminous flux should be even higher than metered. If only I could measure mmol without spending $200 . My whole grow cost setup cost less than that haha.


The theory is that blue light above 11% will significantly decrease the yield.

Here is a interesting and super technical master's thesis and labwork that I am using:
https://digitalcommons.usu.edu/cgi/viewcontent.cgi?article=5650&context=etd

"At a PPF of 500, increasing blue light from 11 to 28 % significantly decreased dry mass in tomato, cucumber, and pepper, but there was no significant effect on soybean, lettuce and wheat. At a PPF of 200, dry mass significantly decreased only in tomato across the blue light range"

Unfortunately cannabis wasn't a species included in the data but the data shows that red/blue and warm white spectrum produces ideal characteristics.

Disclaimer: I am not a professional scientist or botanist, but I do like to learn how things work and I am learning more all the time. I am not even close to an expert.

Here's some of the data from the paper, the X-axis represents the amount of blue light in the spectrum and the Y-axis represents the dry weight yields. In this data it would seem the RB light is the top performer for the lower intensity data set. Notice the slope of the dashed line is heading down as blue light increases. Tomato yield drops 22% when blue is increased from 12% to 28%, Cucumber 26%, Pepper 15%, and all other species with smaller losses, except for lettuce. I know cannabis has very similar nutrient requirements for tomatoes, but yeah the data from the academic community on cannabis doesn't seem to be available, or the schools are too chicken to even allow the study of it.

I should also add, the reason theorized for the increased yield is not due to the plant's inability of efficiently utilizing the blue spectrum, but because at around the 10% blue level the plant responds by growing more leaves/foliage which increase the area which light can be photosynthesized which increases yield. As I think I posted before an excess of red still seems to be important for cannabis and other flowering plants, as the phytochrome hormone that mediates flowering is extremely sensitive to red.

Here's a photo of my canopy, it is pretty uneven but my lights can still cover them evenly as each fixture can be lowered independently without blocking the light. The uneven canopy is mostly a result of mixed genetics. I am a bit worried that my foot long Gorilla Bomb branches aren't going to fill in, the spacing seems a bit stretched. I haven't grown in years though and I usually just grew a sea of green. I'm not used to dealing with big vegged girls so I don't know what to expect. She's been flowering for 26 days from a 35 day veg. If these flowers pack on then I'm gonna rate these the lights winner winner chicken dinner of ultra cheap lights. Otherwise I'll stop screwing around and pick up some real LEDs


Here's a close-up of the plant in question: https://i.imgur.com/zMiNl5u.jpg
I started another thread to ask the others the same question.

[]D[][]\/[][]D said:

She's been flowering for 26 days from a 35 day veg. If these flowers pack on then I'm gonna rate these the lights winner winner chicken dinner of ultra cheap lights. Otherwise I'll stop screwing around and pick up some real LEDs
View attachment 4105974

Here's a close-up of the plant in question: https://i.imgur.com/zMiNl5u.jpg
I started another thread to ask the others the same question.

Click to expand...

no frost though?

lots of frost, but achieved with a high red 3500/1750k mix @ day 29:



(makes better pictures too)

sethimus said:

no frost though?

lots of frost, but achieved with a high red 3500/1750k mix @ day 29:

(makes better pictures too)

Click to expand...

That's looking real nice, there's a bit of frost on my plants but not to any real notable level. I'll take some color adjusted photos tonight, maybe I need to check them again under regular light, they are painful to look at so purple