COB choice for small space DIY

HI! I am in the process of making an LED lamp with COBs for my growcab. Should I go with 3 cxa3070 run at 700mA or another smaller cob? (I'm thinking light spread here, first, efficiency 2nd) suggestions would be welcome as to which ones.

additional questions:

How many watts should I be aiming for in this small space?
Can there be too much light?

also I have already made a DIY LED lamp some years ago and it consists of 9x10w LedEngin LEDs, 2x blue, 4x red, 3x deep red. Those LEDs will preferably be a part of the new lamp. They are run at 700mA. So I already have two meanwell 700-35 I believe.

my details:

cab dimensions
H: 25.6"
W: 29.5"
D: 17.7"

Square feet: 3.6

So, now I'm thinking of ordering 3 cxa3070 and run them at 700mA for a subtotal of ~75w. Including my other LEDs ranging somewhere around 50-60w I'll end up with ~130 actual watts of light in a 3.6 square foot room.

This sums up to 35w/sqf... How does this sound?

too low and I'll bump the cobs from 700mA to 1050mA. too high and I'll bump the single LEDs down from 700mA to maybe 350mA?

Better luck in the LED forums

https://www.rollitup.org/f/led-and-other-lighting.124/

276w assuming 100 lumens/watt would put you at professional lighting levels in that small of a space. But that is way more light than 90% of the folks on here run per sqft. Anything over 100w will work well, 276w is professional max those bitches out bright 7500 lumens per sqft.

http://www.aliexpress.com/item/2pcs-100W-Constant-Current-LED-Driver-AC100-250V-to-DC30-36V-3000mA-for-100W-High-Power/1919848799.html

http://www.aliexpress.com/item/Wholesale-10pcs-of-lot-30W-LED-Chip-for-Floodlight-Flood-light-Warm-Cool-white-6000k-6500k/2011319079.html

Buy a strip of aluminum for the heatsink from home depot and get some thermal adhesive, solder, wires, GTG.

I did my math off the inches numbers not the 3.6 sqft number.

What are you going to grow in? I would find the shortest fattest container you can so the roots grow wide instead of deep so you can actually fit some plant in that space.

Memories of Jr High, ahh.

SnaFuu said:

Better luck in the LED forums

https://www.rollitup.org/f/led-and-other-lighting.124/

Click to expand...

I was totally unaware that there was a separate LED forum! I will start a new thread over there pronto!

nomofatum said:

What are you going to grow in? I would find the shortest fattest container you can so the roots grow wide instead of deep so you can actually fit some plant in that space.

Memories of Jr High, ahh.

Click to expand...

I'm growing in hempy buckets with coco. So what you're saying about the light levels is basically that more is better? I was concerned the plants would suffer or the thc would deteriorate or something... Sounds good to me. I've got most of what I need like wires etc from the last project so that's all good. New thread in the LED section!

8/10 said:

I was totally unaware that there was a separate LED forum! I will start a new thread over there pronto!



I'm growing in hempy buckets with coco. So what you're saying about the light levels is basically that more is better? I was concerned the plants would suffer or the thc would deteriorate or something... Sounds good to me. I've got most of what I need like wires etc from the last project so that's all good. New thread in the LED section!

Click to expand...

The more light the more risk/reward. The more light the greater your potential and your potential problems. I would build 4 100w lights, 2 warm white, 2 cool white. Start off with just one cool white, then add one warm white. Make sure your temps are good, go with that for the first run, then you can add one more (cool in grow, warm in bloom) on your second run. The last one can be used for a mommy chamber or starting seeds for your outdoor garden in the spring.

The one factor I'm not sure how to factor in is the height issue. You want to keep the LEDs at least 6" away from the plant to avoid bleaching. You may need a diffuser to work in that short of a box effectively, or you could use 1w or 3w chips and these boards.