yes but when i mean results diminishing with a distance, i mean with a distance of 4 inches you dont get results.

I dont like growing plants bigger than 6 inch under my T5. i'm sure you could get em a little bigger with the 4ftx2ft model but not significantly bigger.

T5's cost an arm and a leg also. mine was 140$ for 100W
the 400 watt model is around 400$ (i think)
that’s a lot for only 400W and less lumens than an HPS by far

my fixture at 100W puts out 9000 lumens (or 8500 cant remember)
so assuming a linear relationship that’s 36000 lumens for 400W
Now a 400W HPS gets 50 000lm so 12 000’s a pretty big difference

Not to mention HPS gives off UVB light which is very good
T5’s do not