I love growing with mars hydro because..... I can take pictures of the babies while light is on without using flash after turning yellow (HPS) or blueish (MH) off first. I love the build quality and ease of use. The packaging of the light (SP250) is fantastic. Light and strong. The temperatures in the box are manageable with the SP250 not like the HPS. Mars thought of a lot of things when putting the light together. Those waterproof plugs on the cable where a very nice touch, made moving the driver out the box easier!
The light penetration is crazy. We have some very bushy plants (bust with a base mark grow so no pruning n stuff) that only the bottom bottom buds are going all popcorn. Even buds under fan leaves are going strong.
The box is also in our living room, the quietness of the light was also very very welcome. Can watch TV without it sounding like I'm next to an airport!
The main reason we love mars lights? Well that's easy! The babies seem to love the light more than we do even!