My sister started to grow cactuses as a hobby and needed some strong lighting to keep them alive indoors. Boy how botanic specialist stores mark up the price of Led reflectors, I took some of them apart and most of them are just cheap generic chines cob led.
So what to do? Buy a cheap microphone boom arm, a similarly cheap timer and a decent led reflector (30W Philips 5700K) and voila! I got her a growth light for a fraction of the cost and did not even need to buy a single extra bolt or washer Lol
yes it IS working, been about 2 months since I built it and the cactuses are growing nicely
It is also very practical, from time to time I borrow it to use when detailing my car's interior or doing maintenance on my pc.