I just set up a tank with 4 x 1000W MH's with Discus, I had Discus and bred them with 4 w/gal of MH';s, they don't mind the light if you provide cover for them.
At 1.52 w a gallon, I set up a very nice heavily stocked Discus tank with 150 gal and have excellent gloss and full plant growth. CO2 is added(much mor ethe critical issue than light).
It's not hard to do a nice tank with less light.
Just dose 2x a week instead with the same routines suggested for full EI.
50-60% water changes.
Fish are fat and healthy, tank is stable and nice.