Yeild in grams per watt of lighting

I have a question about roughly how much I will yield.

I've read that a general guide to go by is 0.75 grams per 1 Watt of lighting, depending on strain and obviously plant height.

I'm wondering if this same ratio would apply to smaller scale growers. Im only growing 4 plants, under 1800 watts of light. Its a lot of light, but small number of plants.

They are all big and healthy (pic attached, just gone into flowering). Do you think I could expect a total yield of 1350 grams? (1800 x 0.75)

It seems like a hell of a lot of grams to come off 4 plants.

i doubt it, i think the more actual is .25 grams per watt or even less. indoor just doesnt yield that much.

definately not gonna yield .75 grams per watt, But lookin good all the same

its not jsut about light man its the overall size of you plants and the size of pots you are using,i could do a 600w with 4 plants in 7 gallon pots and get a pound in 3 months total. Some people put 3 600s and 8 plants in 1 galon pots and expect 4 pounds lol