confusion about driver selection

[gansho]

ok so I plan to run 12 qb288v2's over a tray for a theoretical maximum 800w.

on a phone call with HLG he recommended to use 4 hlg-185h-c1050b drivers and run 3 boards on each in series.


thinking about it (after purchasing the drivers) i was confused because I thought that it would only run the boards at 1050mA which would be 49.33w each for a total of 147.99w per driver, and 591.96w total.

with some help on the growtube discord, I was told that I was correct and would be unable to run the wattage I want to run.

so we were thinking that an hlg-185h-c1400b would work because on the hlg website the VDC @ 1400ma is 47.7 * 3 = 143.1 fv
the hlg-185h-c1400b says a max fv of 143. I'm told this would be OK.

but after looking at the "Constant Current Driver Selection Tool" on this website, when I choose the quantum board in the dropdown menu, with 3 as quantity, and 1400ma as current, it gives me a fv of 155.4.

VDC
so i figured oh maybe this chart is using the v1 specs instead of the v2. nope. for three v1 boards @ 1400 ma according to HLG's chart the fv would be 149.04.

Now the difference that I noticed was HLG's chart says its at 55*C and this website says 60*C.

I am going to be running without heatsinks, but HLG told me as long as I run under 70w per board I don't need them. And seeing as 66.78w is what they will run @1400mA, I think I am ok.


But will an hlg-185h-c1400b run three boards? whats up with these differences in fv between the hlg website and this website?

if there is an uncertainty should i just get 4 hlg-240h-c1400b and play it safe and lose some efficiency to the driver?

[DaveJonesFan]

There was just a little discussion about whether the HLG-320H-C2100B can run 3 v2's in series within the driver's voltage range and it's just barely inside the range (76 ~ 152V) for that driver at those voltages. Usually HLG recommends adding a 1v tolerance per board, which is what would set you above the limit.

I've seen some designs push the limits succesfully (maybe it was the HLG-320H-c2800, with 3x vero 29 type D or something similar that sometimes worked at the limit) and others where it won't fire up if it's outside the range. Would be risky proposition for sure IMO.

I am pretty sure the constant current driver selection tool on this site is still displaying the v1 boards, for what that's worth.

[Jolly Green Giant]

ok so I plan to run 12 qb288v2's over a tray for a theoretical maximum 800w.

on a phone call with HLG he recommended to use 4 hlg-185h-c1050b drivers and run 3 boards on each in series.


thinking about it (after purchasing the drivers) i was confused because I thought that it would only run the boards at 1050mA which would be 49.33w each for a total of 147.99w per driver, and 591.96w total.

with some help on the growtube discord, I was told that I was correct and would be unable to run the wattage I want to run.

so we were thinking that an hlg-185h-c1400b would work because on the hlg website the VDC @ 1400ma is 47.7 * 3 = 143.1 fv
the hlg-185h-c1400b says a max fv of 143. I'm told this would be OK.

but after looking at the "Constant Current Driver Selection Tool" on this website, when I choose the quantum board in the dropdown menu, with 3 as quantity, and 1400ma as current, it gives me a fv of 155.4.

VDC
so i figured oh maybe this chart is using the v1 specs instead of the v2. nope. for three v1 boards @ 1400 ma according to HLG's chart the fv would be 149.04.

Now the difference that I noticed was HLG's chart says its at 55*C and this website says 60*C.

I am going to be running without heatsinks, but HLG told me as long as I run under 70w per board I don't need them. And seeing as 66.78w is what they will run @1400mA, I think I am ok.


But will an hlg-185h-c1400b run three boards? whats up with these differences in fv between the hlg website and this website?

if there is an uncertainty should i just get 4 hlg-240h-c1400b and play it safe and lose some efficiency to the driver?

welcome to the forum.

the difference in the numbers like daveyjonesfan said is V1 vs V2.. the guide on here still V1... so you are correct on the 47.7v at 1400ma.

800 watts divided by 12 boards is 66.67 watts each. the V2 boards at 1400ma is right there at 66.78w. you "should" ( in theory ) be able to squeeze the 3 on a 185h-c1400.. making your driver run max efficiency... or if you want to be 100% safe bump up to a hlg240h-c1400. the 143.1 v is still over 80% of the max voltage range... still making the driver run near max efficiency..

correct ... running any quantum board under the 75w range should not require a slate heat sink... just make sure there is good air flow over them and you'll be fine.

any other questions don't hesitate to ask..
again welcome

[gansho]

what about four qb288v2's on an hlg-320h-c1400b? that's 83% of the voltage, and its a driver that will dim to 0 which makes using the trolmaster controller easier to wire up since it is capable of dimming to 0.
anything wrong with this config?

[Jolly Green Giant]

that works also.. 4 240's or 3 320's.