It's something that's puzzled me too.
Last time out I dumped the cmh lamp and just used 3 x 20w LED security lights in an effort to try and emulate the sun.
Can't fault my ambition eh
I had 1 light top centre, firing straight down and then one at each end, angled inwards at about 45 degrees.
Using individual timers I had one come on at 6am, then lit them up and put them out to give me a dawn at one end of the case, a midday, and then dusk at the other end.
Primitive I know, but results were far better than I expected.
The most obvious benefit was the popcorn buds were pretty much gone and everything was even orange all down the the plant.
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