DSunY Silver Middle Panel No Controller Add Additional Panel for D3 Series Led Aquarium Ligths

I have been using this product for about 6 months on a 150 gal marine tank with 75lb of live rock. I replaced 500 watts of metal halide bulbs. I started out with 1 unit and was pleased with the manufacturering quality and depth the light can reach. I am comfortable on moving forward with introducing corals into the tank now.Programming setup is a little challenging at first but after playing with it for a few days it's becomes easier. I like that it saves the setting even if you loose power.There are 2 types of panels. End unit and start / middle unit. The end unit has only 1 cord for the end of the daisy chain. The others have 2 cords, controler in and out.1 power supply failed after month 5. As with anything marine tanks, have backups will mitigate your down time.Power supplies run hot and are in a small package. Make sure that you give them lots of space. Running a small fan over them helps keep their temperature down.I definitely recommend this product.