How to arrange 6 x CXB3590 to cover 750mm by 750mm

[yosim]

Hi

Im about to starting building my own LED fixture with
6 x CREE CXB3590 3000K, CB 36V, 80RA running off 1 x MW LED driver HLG-320H-C1400B

Ive got 2 heatsinks, each 550m by 145mm

was thinking if i left 150mm roughly between the heatsinks in the middle then id have about 150mm out to the edge of the tent on each side

but with the overlap of COBs in the middle should i space the heatsinks further apart so as to provide more light to the sides?

any advice would be appreciated, thank you!

 

[weed-whacker]

so 2 bars of 3 cobs equidistant from the edges but it won't be perfect as it will be a 2x3 configuration

i see what ur saying though,my logic is to (in ur mind) divide the space into 2 parts, one for each bar-so you will cover a 75x37.5cm space per bar, light in the middle of each section means that the centre of the les would be 18.75cm from each edge.


so the left side of the left heatsink would be about 18cm from the left side of the tent meaning about 36cm between sinks

 

[yosim]

not sure im with you but leaving 18cm between edge of heatsink and tent will push the heatsinks closer together in the middle, is this what you are saying? that was kinda the way i had them space out originally (ive got a mock layout going on on my floor)

Im kinda inclined to go the other way and bring them closer to the edges, leaving more space in the middle, as there should be adequate overlap in the middle from all lights

thanks!

edit: ah yes, the centre of the heatsink not the edge - yeah that was my original plan

 

[grouch]

I would leave a little extra space in the middle and focus on hitting the edges since the middle will benefit from both bars. It would probably be easier to just light them up and play with the footprint. Are you putting plants all the way to the edges?

 

[weed-whacker]

not sure im with you but leaving 18cm between edge of heatsink and tent will push the heatsinks closer together in the middle, is this what you are saying? that was kinda the way i had them space out originally (ive got a mock layout going on on my floor)

Im kinda inclined to go the other way and bring them closer to the edges, leaving more space in the middle, as there should be adequate overlap in the middle from all lights

thanks!

edit: ah yes, the centre of the heatsink not the edge - yeah that was my original plan

36cm in the middle

 

[yosim]

I would leave a little extra space in the middle and focus on hitting the edges since the middle will benefit from both bars. It would probably be easier to just light them up and play with the footprint. Are you putting plants all the way to the edges?

thanks - yeah i will be shoving 4 plants in there so it will be pretty full

reason im asking is that i need to get some Aluminium angle to hold everything and therefore need to know dimensions before i buy it

 

[grouch]

thanks - yeah i will be shoving 4 plants in there so it will be pretty full

reason im asking is that i need to get some Aluminium angle to hold everything and therefore need to know dimensions before i buy it

Get a little more than you need and drill multiple holes. Nothing like having a little flexibility inside the grow space

 

[yosim]

Get a little more than you need and drill multiple holes. Nothing like having a little flexibility inside the grow space

you know what thats a very good idea - I could just get 2 bars for each end parallel to the heatsinks, like top and bottom - then as you say, drill multiple holes if i need to

2 aluminium bars should be enough to hold the heatsinks, driver, COBs? what thickness aluminium should i be looking at as a minimum? I dont want anything sagging

thanks