Building a Cree Light for a 2x2 area. ( suggestions, thoughts, etc. )

Uberknot

Uberknot

Well-Known Member
Those are circle 90 mm fans on the heatsinks. I can't screw into them from the top so I will have to consider that as well.
 
Uberknot

Uberknot

Well-Known Member
Airwalker16

Airwalker16

Well-Known Member
Uberknot said:
heh....those are mounting screws they hold down the heatsinks to the plate....I'll figure something. ;)
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And your point is? Do you not see how the guards have four little legs that come out to a circle? They go under a screw. Just take your screws out for A second, place the guard there, and put them back on. Do I really have to explain this? Lol.
 
Uberknot

Uberknot

Well-Known Member
Airwalker16 said:
And your point is? Do you not see how the guards have four little legs that come out to a circle? They go under a screw. Just take your screws out for A second, place the guard there, and put them back on. Do I really have to explain this? Lol.
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They are heat sinks for a CPU the screws sink lower than the fan....look closer.... There is no way really to use those with this CPU type fan/heatsink.
 
Trippyness

Trippyness

Well-Known Member
Uberknot said:
Yeah, I know, it's running about 28-29k lumens total at 1300 mA thats at the 1/2 way mark on the driver. My goal was to get the 7k lumens or better per sqt ft. The one thing about this light bugs me is those 4 fans and no covers so you have to be really careful with everything you do or you can hit one of the blades. I will have to figure on something in the long run.
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You should quit with the lumens and go for par watts. But for simplicity 25w a sqf of led is enough for a good grow or 15 par watts. 250 x efficiency = par watts. CXB 3590 at 250w (1.4a) x 51 = 127.5 par watts. 127.5 / 4 sq/f = 31.87 PAR watts total. More than needed wattage. You could cover a 2 x 4 with that wattage at 15 sq/f. If I were you I would go 150 watts at about 19 par watts in that space at 1.4a. No point in wasting power. Dhould check out SupraSPL spreadsheets. Lumens are for humans. Nice light. Hope that helps.
 
Airwalker16

Airwalker16

Well-Known Member
Uberknot said:
They are heat sinks for a CPU the screws sink lower than the fan....look closer.... There is no way really to use those with this CPU type fan/heatsink.
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If you can unscrew those screws on the corners of the fan, you can use them to anchor the guard.
 
Uberknot

Uberknot

Well-Known Member
Trippyness said:
You should quit with the lumens and go for par watts. But for simplicity 25w a sqf of led is enough for a good grow or 15 par watts. 250 x efficiency = par watts. CXB 3590 at 250w (1.4a) x 51 = 127.5 par watts. 127.5 / 4 sq/f = 31.87 PAR watts total. More than needed wattage. You could cover a 2 x 4 with that wattage at 15 sq/f. If I were you I would go 150 watts at about 19 par watts in that space at 1.4a. No point in wasting power. Dhould check out SupraSPL spreadsheets. Lumens are for humans. Nice light. Hope that helps.
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Yeah if I turn it all the way down I might be able to get that. where did you just get the number 51?

In order to use just 150w I would have to turn in down lower like 900mA.

at 1.4 mA it uses 195w which is close to what I am testing atm.
 
Airwalker16

Airwalker16

Well-Known Member
Uberknot said:
that's ok I am not removing the heat sink.... lol. :P
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You're saying you can't unscrew four screws to add fan guards. .. whatever man ive tried to be helpful but you just don't understand. Anyone who's used guards would agree that it's a very very simple fix. @Rahz
 
Uberknot

Uberknot

Well-Known Member
Airwalker16 said:
You're saying you can't unscrew four screws to add fan guards. .. whatever man ive tried to be helpful but you just don't understand. Anyone who's used guards would agree that it's a very very simple fix. @Rahz
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No problem, I have 180 mm fans with guards on them on a flat fan no problem. The heat sinks are on there and tightened down and I really do not feel like redoing any TIM for any reasons. those screws go all the way through the plate and they have a metal locking ring at the bottom of the heatsink so they do not come out. In order to remove one of them I would have to undo that heatsink from where it's seated just to attempt to remove that locking ring. Basically I have already thought about that and it was more trouble than it was worth to try to remove those hardened steel lock rings so I didn't bother with them.
 
Airwalker16

Airwalker16

Well-Known Member
You could get a mesh and glue it around the edge and put a nice strip of something around the circumferene of the fan case.
 
Trippyness

Trippyness

Well-Known Member
Rahz

Rahz

Well-Known Member
Trippyness said:
There is no harm in more photons but diminishing returns.
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Some lighting strategy might improve the returns, not to negate what you're saying.

Good:
plant 1, 8 weeks 800 PPFD

Better(?):
plant 2, 3 weeks 500 PPFD, 4 weeks 900 PPFD, 1 week 500 PPFD. Average PPFD over time: 700

Best(?)
plant 3, 3 weeks 550 PPFD, 4 weeks 1050 PPFD, 1 week 550 PPFD. Average PPFD over time: 800
 
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