Search results

Buzzwords and marketing. Maybe if they managed to make green leds as efficient as blue leds and make white light with RGB LEDs as opposed to blue leds+phosphor it would be a "new led grow light"

T5HO tubes from Osram drop to about 90 after 19k hours. I completely understand you, but for people who can't spend much and want to test the waters of growing it's perfectly viable. 130 dollars for 320 watt, ready. Plug and play. COBs are better, but do have a higher starting price. And...

I know how to get the data for lumen, but don't know the LER of those chips. Thanks anyway, I'll look into Bobby_G and Cobkits posts.

Anyone have the efficiency chart/spreadsheet for the Citiled COBs? CLU048 and CLU056

There are 2700K and 3000K T5HO lamps that are suited for flowering. For grows under 500 watt, it's pretty cost effective because those lights have an ok efficiency and last longer than MH or HPS. T5 HO is also pretty bright, normal T5 bulbs at 4 feet are 28 watt but 4 feet T5HO bulbs are 54...

https://cobkits.com/product/clu058-1825-light-engine-single/ How long does the backorder take? I don't think 4000k 90CRI would be ideal for flowering. Also great to see somebody who sells for extremely fair prices as opposed to rip-offs.

https://cobkits.com/product/citizen-clu048-1212-90cri-choice-of-color-temps/ With heatsink/fan/reflector/holder https://cobkits.com/product/clu048-1212-active-light-engine-single/ Is a better deal until Cree starts selling newer updated models. But even better...

That 30 watt ebay light is poop. Wasted money. A T5H0 fixture is better value than that. http://www.ebay.com/itm/T5-HO-Indoor-Grow-Light-4-ft-4-Lamps-DL844-Fluorescent-Hydroponic-Fixture-Veg-/222058071890 T5H0 is pretty nice technology. Plenty cheap, 75 dollars for 230 watt. Replacement bulbs...

No way it has 160k lumens but it should be fine.

https://senlu-lights.en.alibaba.com/product/60274611240-219300476/High_Power_Detachable_IP65_150w_Led_Industrial_High_Bay_Lighting.html?spm=a2700.7803228.1998738836.887.hpyEx1 4 pcs COB type: CLU038-1205 each COB watt is 33.5w. With a 90% efficient driver, so they say. For 150 dollars, dunno...

You could always hang a fan next to it.

4, CLU-048s, +- 50 watt each. Completely preassembled with driver and heatsink. For 160 dollars? I can hardly believe a deal that good. Tremendous deal if that's for real. If you buy it, please keep us updated. I'm inclined to buy one too.

I hate these "diy cob kits". It's obviously trying to get some easy money. 200 dollar for a single vero 29 and a cheap power supply. My ass. Edit: Hate, not had

Passive is always a bit more expensive for higher wattage. The CLU550 at max power is a 595 watt COB. And at normal power it's already 250 watt. So expensive cooling is to be expected. Though I doubt it can take a full power CLU550, 600 watt is a bit too much for that.

How do you guys do reflow soldering?

Anybody got an idea if this board is in series? http://www.topledlight.com/Aluminum-PCB-Board-42-Spots-82mmx66mm-For-CREE-XP-E-XP-E2-XP-G-XP-G2-XT-E-LED_p1635.html I think it is 99% sure, just want to be 100% series there's nothing parrallel

Yea, I was planning on an other heatsink anyway. Things wouldn't have fit anyway.

For the price it isn't exactly impressive. Too expensive for what it is.

Spreading out definitely helps a lot. But it's going to depend on the surface area and just how spread out. Heatsink being hot is probably just aluminium being good at heat convention. Can already cause burns at 44 degrees celcius.

You mean this? http://timbergrowlights.com/100-watt-osram-oslon-ssl80-660-nm-4x25w-kit-meanwell-hlg-power-supply-free-shipping/ It would add too much clutter for me. I like to keep things neat, even if it may be at the cost of a little efficiency