Differences

This shows you the differences between two versions of the page.

--- cob_grow_light [2022-05-19 07:31] – created river
+++ cob_grow_light [2022-05-21 10:55] (current) – removed river
@@ Line 1: / Line 1: @@
-====== COB Grow Light ======
-**Status**: Complete
-{{ :cob_grow_light.jpg?600 |}}
-I (River) bought a COB LED module from aliexpress for 1.45. It claims to be a "full spectrum" grow light, and 50W.
-I soldered some wires onto the aluminum board using the hot plate as a preheater and finishing with a soldering iron. Earth connected to heatsink with an anti-shake (jaggy) washer to get some bite through the aluminium oxide. Earth is critical as live only separated from heatsink by microscopic dielectric layer on board.
-I fitted it to a heat sink with thermal tape and laser cut a cover which slotted into the heatsink.
-I've been using the light for a week or so now. It gets hot - too hot to touch, at about 75C with ambient ~25C, but not too hot for the electronics I think. Efficiency seems questionable.
-Otherwise it seems to work well. It is pink.
-{{ :cob_banding.jpg?600 |}}
-The camera shows the flicker from the unfiltered bridge rectifier. You can also see some of the LEDs in this image.