Chlorophyll a UVA chlorophyll B UVB, b is believed for the photo protection the terpenes. So red blue light= great for chlorophyll A UVB = great for chlorophyll b in small doses. Caratenes as well for the B. Thylakoids read about em.
Lumens represents the power of your light you find out the lumen rating and then convert all the way to power. That is the wattage the light is putting out. What it is consuming is a completely different calc. I put a link in sig.