I have both quantum boards and bars. mostly, I’ve been using the quantum boards on plants when they are quite small I like to use the bars when I’m flowering them I use a Apogee Par metre to make sure i’m getting my desired intensity by adjusting the dimmer accordingly
I realise the leds don’t shine down directly 90°. They are angled, so the light is cone shaped Therefore, as the light is raised The canapés footprint expands.
At the expense of using more lights, I don’t expand my footprint as much as I would, if I raced to the lights more and turned the dimmer up.
I do this because I don’t want to burn out my leds they don’t like getting hot I don’t know if this is a good way to do it but at the moment I can’t see any logical reason why I would do it different but I’m quite willing to listen to one’s logic that differs from this opinion because I’m here to learn