Agree, and I just got the parameter with the 130W,1:1 ratio, I think it is pretty good for my tank.
2 inch: 61,700 lux;1278 mmol; coverage 0.5 ㎡
12 inch:60,800 lux,1250mmol;coverage:0.785㎡.
20 inch:32,400 lux, 602mmoll;coverage:1.06 ㎡.
30 inch:18,800 lux, 258mmol; coverage:1.76 ㎡.
40...