New Quantum board qb96 V2's are out from HLG. Cob replacement fixture-Replacement Thread **BS here**

Cuz real texans get stoned on whiskey...

 

I hate politicians...

 

Running four 96s at 120w (lowest of 4 power levels) each at 18” above grid, in 4x4: four pucks can’t evenly spread sufficient far red to raise a 730 peak for a1ft perimeter of the tent (50% of sq ft).

The best positioning is:

Center 50% of footprint has equal or signif greater 730 peak than targeted.

Some additional footprint coverage can be gained by raising to 24”; but, due to positioning adjacent to a 96, the 96 would also have to be raised from it’s optimal height so as not to block the puck’s light.

The four pucks have a combined total of 16 far red diodes, probably need at least 2 more pucks, for at least 24 diodes ($45x6=$270).

I think the primary problem with the puck is that all four diodes are in a small square configuration, putting out high intensity in a small footprint. The target spectrum from the 288s above has 16 far red diodes as well, but spaced out individually and uniformly in 4 rows across the 4x4.

I have a 28 diode growbright far red bar ($130), i’ll locate it in center of tent at 18” and see how it does.

 

Basically, a single puck covers 2ftsq @ 18”

 

Ok, so here is the rapidled fr puck/growbright smackdown:

Here is the target red spectrum, i’m shooting for:


Here is the actual 96 spectrum:


For simplicity, since there are essentially four equivalent quadrants with a single 96 covering a 2x2 area, i am showing the spectra for a single single quadrant.

The physical layout of pucks and bar are:


Note the numbers in the drawing, these are positions for various soectra below.

With only the specified far red light running, here is their intensity, color temp, and spectra at 18” above grid.

Rapidled FR puck:


Growbright FR bar:

 

Keep that intensity level (12.1ppfd vs 4.2ppfd) in mind when you look at the spreads.

Spectra by positions shown on drawing:

Rapidled:
A

 

Bar:



You don’t need much Far Red intensity to make a big impact, but you do need good diode spread.

A single growbright bar ($130, single plug) provides relatively even coverage, four rapidled pucks ($180, four plugs) don’t.

 

What’s your question?

 

No, one of those for far red in a 4x4 w four 96s

Two pucks w one 96 for 2x2, or 6-8 pucks in s 4x4 w four 96s

 

@Hunter2348 Get you 288s yet?

 

An inexpensive diy alternative to pre-made far red lights, per @randomblame on riu:

“You can get 10 top XP-Es/720-740nm for ~25$ from e3ay. (They also have XP-EHE deep-red in C01 bin(10pcs 20$) or top bin XPG3s)

https://www.ebay.com/itm/10pcs-Cree...116845?hash=item4b23bcb4ed:g:txsAAOSwKUhZsUG5

One could use a 3ft. 25x 25mm alli c-channels for proper cooling and distribution and a cheap MW APC-25-700. You will get a 15w net far-red bar with ~30-35μMol/s PPF for less than 40 bucks. Maybe 18wall watts.. Two of these bars would deliver a pretty even coverage in a 4x 4' tent. One can also use a 1000mA driver for ~25w, such a c-channel still has enough surface area for passive cooling(1320cm² and one need ~50cm²/w LED).

These seller also has 16" strips with 12 Cree diodes(white or blue or red). When someone asks them, I could imagine they would create them even with far-red diodes or with a deep-/far-red combination. I have asked them for deep- and far-reds in top bin maybe 8 month ago and a week later they made them already available, same with the XPG3s .. so I think, its worth to ask them again ... of course only if interested in 16" strips.”

 

Gonna have to take a weedwacker to that...