Keef, those COBs that hippy linked to are the size of a softball. They are designed to be mounted 8-10 inches apart and the driver is the size of a 400 watt hps driver. Won't fit in your Mars chassis but that is actually a good thing. It allows you to tailor the light footprint to your individual grow. I'm pretty sure this may be the future of led lighting . The chips themselves run about 50-55 dollars apiece but then you have to add the heat sink and chip holder, probably a lense of your choice and then achassis to mount it all. Including the driver you wind up paying about the same as a comparable pre-built model using similar technology. Just my opinion. :vap-Bong_smoker:
Sorry about the car, I just went through that myself.