Needs help with led lights

Chrisz0825

Chrisz0825

Active Member
I currently run 2 Mars hydro reflector 192s I'm a 5x5 grow tent. I have been using them for about 2 yrs now and I'm rdy to upgrade. I plan on buying a par meter to get my lights the perfect distance from plants but I want to be sure I'm not gonna be overloading my tent with too much light. Ive been reading and reading and reading about par and lux readings and I want to be sure before I purchase some more lights that I'm not getting too much or too less. Initially what I want to do is grow 4 plants in a 5x5 tent with 4 led lights. One light per plant. What wattage light should I settle on so I can have 4 in the tent and I'm not going above the par of 1000 to 1200. Is 4 too many? Should I settle for 2? I have a basic understanding of what I need, I just need further guidance.
 
StreetPreacher

StreetPreacher

Member
That's my question Cobkits. I am in need of a new light to use exclusively for the flowering cycle. I currently have an old Mars 700w, and I recently bought a COB fixture, but I'm not certain if either is the best choice. What would you suggest for a new flowering light? Here are the specs for the COB I have now. I'm looking to cover a similar area to the OP, sorry to hijack ;)

Our custom full wide spectrum (380nm to 850nm) Includes UV and IR wavelengths. This means you get an extremely versatile grow light that is ideal for every stage of growth. From seeding to flowering you have it all in one complete system.



LED x500 Specifications



Size 350*508*90mm Actual Power 240 Watts
Input Voltage AC85~265V LED Quantity 24pcs 20W COB
Output Voltage DC32~45V LED Type Bridgelux
Lifespan 80,000 Hours Ratio Full Spectrum/UV/IR
Working Environment
-20~65℃，
45%~95%RH

PPFD
2356umol/1feet
1685umol/3feet

Net Weight 9.1kg Lighting Area 5x5 Feet
Warranty 2 Years Replaces 500 Watt HPS / MH
Lumens Per Watt 160lm G.W. 14.5kg
Flux Lumens 38,400lm IP Rating IP66
LED Driver Meanwell Driver Color Rendering Index 95+
Click to expand...
 
Chrisz0825

Chrisz0825

Active Member
CobKits said:
were you planning on buying 2 more mars? there are a lot better options
Click to expand...
I didn't plan on getting 2 more Mars. I would like to keep the Mars as backups and purchase 4 led lights. I think with 4 lights vs the 2 I will be able to get full coverage of the 5x5 tent instead of having wasted light around the edges of the tent
 
StreetPreacher

StreetPreacher

Member
I'd imagine that Cobkits would prefer to promote his products? :)

What would you recommend to replace a Mars II 700w light? And this light will be used exclusively for flowering, so it seems silly to buy a Mars II and then just run it in bloom mode, which I believe just turns off all of the blue/green diodes, which reduces overall light output making a 700w more like a 400w when only running the red/orange/uv/ir.

I was going to just pickup another one of these COB fixtures, but after some research it look like I might be better off going DIY and just getting a few COB 'light engines' in the red/ir/uv range and building my own custom spectrum?
 
GrowLightResearch

GrowLightResearch

Well-Known Member
Chrisz0825 said:
One 192 alone gets you 1200 in the hot spot.
Click to expand...
Because there is no way that 1200 is true unless the distance to the canopy is short.

I do not have a Mars unit so I cannot measure so the 250 is a guesstimate. The say their LEDs are Epistar with wavelengths of 440, 460, 630, 660, 730, 2700K, and 3000K. Problem there Epistar does not manufacture a 440, 630, 730, 2700K or 3000K. And they look like Epileds, not Epistar. So I cannot lookup the datasheets on the unknown LEDs used.

I cannot believe anything this vendor says so I based it on a similar unit I measured. EpiledPPFD.jpg

Below is the PPFD Plots for a 1000W HPS (source Cree June 2016 Horticulture Reference Design)
Numbers are µmol/s/m² at 1 meter height.
Gavita1000WattHPSuniformity.jpg
 

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