So this seems to good to be true … 6 bucks for a true 50 watt LED and it’s driverless. What am I missing? It sounds like one of these for every square foot amd you’re good to go. Can’t be right … https://www.amazon.com/gp/aw/d/B071K8HBQB?tag=greenrel-20

It looks like it has a decent color temperature, though that is stated as two different temps, The question says somebody actually measured the watts at 50+. Now all you don’t know is how efficient it is. They never once mention lumens. Going for 180 or more lumens per watt is why people use COB…

Those aren’t cob light, well they are but it’s the cgip if you are building your own

When you get into diy leds the led cost itself is only a small portion of total cost. As already noted on this forum, those driverless cobs put out a small amount of light and a lot of heat. Which is a sign of poor efficiency as @1BigFella pointed out. Due to the size of components used we’re assumi…

Alright, I appreciate the feedback. I figured they were too good to be true. Wanting to up my game during flowering so just looking around.

What are you already working with as far as space and lights? And what’s the budget?

@dbrn32 2’×4’ and a collection of fluorescent and LED shop and household lights. I’d spend $100 to $150 and I really don’t want to draw more than 300 to 400 watts. Indoors for me is now mostly seed production and vegging.

That would be tough to do without a little more in the budget as far as cobs go, mainly because of heatsink costs. You could go to like 4 50 Watt cobs for probably $250ish. Do you have access to any cheap/free aluminum plate or bar stock? Not sure if you’ve seen what @Myfriendis410 or @BIGE have do…

Lots of people sell cheap heat sinks on ebay, but they mostly are too small. It is possible to mount your COB on a few square inches of 1/4" copper plate and then attach two of the small heat sinks to the other side of the copper plate. But once you’ve paid for the copper and heat sinks you’re get…

The biggest problem with the driverless COBs is the light is only about 70% as good as a decent LED light. I’m testing a 300 watt setup with 50 watt full spectrum driverless COBs on my autos and I have the light very close. [IMG_20171209_154451499]

Looks like the Chinese have figured out “COBs” are the hot item, so they put a bunch of cheap not-so-great surface mount LEDs on a board and throw it on ebay, amazon. or whatever. The problem is those LEDs are no better than HPS, so you need more of them and more heat sink. (And more electricity f…

COB light question

Indoor Growing Lighting

1BigFella March 7, 2018, 12:34am 16

Or even an old aluminum frame from a broken sliding glass door! It’s all about square inches of surface area. Doesn’t matter what it was before.

Electricity bills and law enforcement?

Topic		Replies	Views
DIY driverless COBs test update Lighting	134	5631	December 1, 2019
New product on amazon? Lighting	7	717	February 25, 2019
Opinions on COB vs QB LEDs Grow Room	28	2046	November 15, 2020
COB (chip on board) led 50w warm white Lighting	124	6574	May 30, 2018
Mini cob veg light (50watt) Lighting	101	2147	April 8, 2018
How many of you growers are using driverless COBs Lighting	94	5955	October 3, 2018
I want to build my led light Lighting	51	1049	August 23, 2018
Northern Lights/Green Dream/Tahoe OG/Pineapple Kush Grow Journals	23	1762	May 24, 2017

COB light question

Related topics