Looks good, Numbulan! If you can use recycled parts, you can get them done cheaper, and that's the way to go!
You are probably right, if you use narrower beam angle, and hang it high, you might get a more even coverage. I've tried relatively wide DIY reflectors (from yogurt container and empty can from canned food), but I'm not using it any more. But without the reflective enclosure, you could waste some light without reflectors. In a grow tent with multiple COBs, the unevenness does get reduced quite a bit. But it is an disadvantage of this types of LED.
pmatil, what's the plastic mirror sheet?
You are probably right, if you use narrower beam angle, and hang it high, you might get a more even coverage. I've tried relatively wide DIY reflectors (from yogurt container and empty can from canned food), but I'm not using it any more. But without the reflective enclosure, you could waste some light without reflectors. In a grow tent with multiple COBs, the unevenness does get reduced quite a bit. But it is an disadvantage of this types of LED.
pmatil, what's the plastic mirror sheet?