Marine RC is with nylon mounting box for recessed mounting,while Marine SF is for surface mounting.
They are with anti-corrosion tin-copper housing with excellent heat-conducting ,small housing but big power.
Marine RC is 24 watts without lens ,flood beam angle 110 degrees.
Marine SF is 15 watts with lens beam angles 15°,24°,40° as options.
IP68 waterproof. Ideal for the pool even with chlorine water,outdoor pool even near the sea and other underwater places
3 years warranty as standard, 5 years as options.