You just feel a need to dump on everyone's threads dont you UB ?
I only dump on silliness or stupidity, take your pick. I've said it before, there is no validity regarding this erroneous "measure". It is another forum paradigm (like flushing) that refuses to die.
I'll explain it to you reeeeeeeeeeeeeeeeeeeeeeeeal slow.
1. No two light systems are the same,
2. No two gardens are the same,
3. No two plants are the same......
4. No one measures f.c. or PAR values at a constant distance from plant heights,
5. No one takes into consideration side lighting or reflecting panels. Panels alone can increase light up to 30%,
6. The plant material, grams, one grower measures is gonna be different from the other. It's all anecdotal evidence without any certification. The scales will be skewed from one to another..
Since you're drawn to hype and fallacy rather than facts...... I doubt if you're capable of understanding the variables thingie. Watts as it relates to production means nothing, only what a plant receives which is gonna be different with each hood, bald light, lamp source, temp change, watering, etc.
Having said that, it's OK to talk the talk as long as folks realize the anecdotal measurements are meaningless.