2 X 240w QBs.
The plants are Green crack auto's and the height difference was 50cm to 120cm.
I used one light till the last week's of flower.
I use a lux meter to help with lamp height and intensity.
The numbers you go for are..
Seedlings 5000 to 7000lux
Veg 15000 to 50000lux
Flower 45000 to 65000lux.
I bought a proper meter for £25 but you can get a phone app.
The diary is on here TT fast lap.
It was a real learning curve as I hadn't a clue

I found having 2 lights helped with the difference in plant height.



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