I am not sure what you mean by modular approach but each unit has 55 3W led set up in a strip fashion.30 blue and 25 white.Each color has its own power cord.Also my units has moonlights as well.As far as growth I would not say it is better since my corals grew like crazy with T5's ,I think it is about the same,with some corals closer to the bottom showing more growth then with T5's.It means light penetrates better than T5.I did bleached out couple of my corals.Overall I am very happy,but planning to supplement those with 2 KZ Fiji Purple T5 bulbs for better color on my red and orange corals.They look a little washed out when all LED's are on.Blues and green look great.When only blue LED's are on I get to see colors I never seen before with my T5 light.Mostly my LPS show beautiful fluorescent colors.