many would be interested in sourcing from Shenzhen factories i certainly don't anymore. after dealing with mufue, bava, hansion, meijiu i was not impressed by their product transparency. and i couldn't be sure what i eventually end up getting(see supposedly lm561C with only 130lm/W). in the end the...

unkle_psycho wrote: ↑

Fri May 04, 2018 1:22 pm

Wow, so you mean Vesta beats F-series when driven hard?

in terms of cost: yes, by 6$ (ignoring bulk rebate by samsung)
by photon output: yes, by 10%
efficiency-wise: no. 3.5% short
(this assumes 2x vesta (@2A) vs 1x f564B (@1.8A))

you could however lose more efficiency because each led is getting hotter. and 2A is at rated maximum current.
on the other hand, would you also suggest running 5000K-only in veg stage?

2pcs vestas cost still 6$ less than 1pc F564B. and when you then compare these 2 Vestas with a F564B that's driven hard(@1.8A @50°C) the VESTAs efficiency is only 3.5% lower, while delivering 10% more umol/s. (this no estimate. it's all calculated using samsung Led engine calculator and livinglight'...

LivingLight wrote: ↑

Fri May 04, 2018 11:29 am

here are the spectrums

for this graph, did you supply each with the same input wattage?

LivingLight wrote: ↑

Fri May 04, 2018 10:57 am

i prefer to choose a decent spectrum even losing some photons

so would you, for example chose lm561C 90CRI over 80CRI?
but you would have a tiny bit less YPF/W right?

using the LED engine calculator i compared F562B with Q562A. I matched their temperature to 35°C drove the F562B softer (at 70%) to match the wattage to each LED (Fseries has 1.8x more LEDs than qseries. 72 vs 40) qseries vs fseries. power per led matched.PNG so to wrap it up: if you get a F-series ...

How are you wiring them, in series? if I run 3 strips off one driver won't they only be pulling ~ 8 V each? i had everything in parallel (including pot :D ) it divides the current. so 3 strips will be 1A per strip and they will pull around 24v. just check this video series by LEDG https://www.youtu...

Cmm2526 wrote: ↑

Fri May 04, 2018 1:31 am

The strip uses 23v, would running at 50% mean you lower the potentiometer until they receive 11.5?

voltage will always stay around 23V. u regulate the amperage. i recommend the video series about HLG drivers for explanations: https://www.youtube.com/watch?v=MdLeA2BFT0A

my imagination is too weak but i think A type would be better because its logarithmic curve would cancel out the logarithmic curve of the driver and result in a linear dimming experience. however it doesn't make much of a difference if you use these mini displays i posted about earlier in this threa...