How do they look?

Lux is only comparable to the exact same lighting -- doesn't have to be the same fixture, just same characteristics of light. Simply put, the varying intensity colors for any lamp, even within 'white' light, will give varying Lux measurements. So, it can still be useful for you, but you'll need to read plant and measure to find that happy zone. Allow plant benaviour to tell you when it is happiest. Leaves will be perky, internode distance will be tight but 'enough' space, and growth will be vigorous. When you see it kinda droop at top or even form pale spots, you know it's way too intense. Also, internode length will get too short. while it is good to have a wet-dry cycle, i think some of your plants look a little too dry. one looks to be wilted. Except in cases of a small plant in large pot, make sure entirity of substrate gets saturated. then, allow it to dry out. Weight of pot is best, but top 1" is good indicator too. you'll have a more consistently happy plant, if you do. As nutes in soil run out and you fertilize more, you'll want more runoff to ensure a good equilibrium of nutes in soil.