But the led would direct all of its light down where the tube goes everywhere. I wonder if taking reflectivity into account if the tubes have enough loss to where the led provides higher par at the substrate?.
some studies have shown that, on a watt/watt basis and even considering t5's can produce 100 lumens per watt when most older LED's were around 50ish the LED still outperformed t5's on a 2:1 basis. Much due to exactly what you deduced.
Which was why I 'conservatively" said they were equal-ish.. Err on the low side so to speak.
One can deal w/ more light easier than less..
That 20% less lumens of the LED is nothing really..
I just didn't want to go so far as say the light is actually say 40% stronger yet 20% less lumens..
