Im not sure what question your asking here? How many lights would use for a plant if a 100watt light= 1000 lumens? or, how many plants could you light with a 100watt/1000lumen light? I would use as many lumens as possible for my plants.
Every lighting system is different. Some put out more lumens-per-watt than others. Anyway, as is often mentioned, "lumens are for humans", and if you care enough, you'll do your homework and learn about "PAR Watts". You'll also study the various light requirements at different stages of the plant's growth. There is a place for CFL, fluorescent, MH, HPS, LED, and UVB lamps in cannabis growing. Most people use HPS lighting for the flowering stage because of its colour, and because it's very efficient, putting out lots of lumens-per-watt. But that intensity changes over distance-to-lamp, and also differs from lamp-to-lamp. A 600W HPS lamp puts out more lumens-per-watt than a 1000W, for instance. I'll attach an image to get you started. -mu
Generally, for watts, you want atleast 100w per plant, not what the package says it is equivalent to but what the CFL really uses. Lumens are what matters for figuring out lights but 100w per plant will put you in the right neighborhood.