Rovaxin aluminum alloy frame with RGB lighting for freshwater and saltwater aquariums. Stimulates plant growth and enhances fish colors. Power Size Aquarium Size GX-S200 - 10 watts 178 mm 20-30 cm GX-S300 - 13 watts 278 mm 30-40 cm GX-S400 - 18 watts 378 mm 40-50 cm GX-S500 - 22 watts 478 mm 50-60 cm GX-S600 - 24 watts 578 mm 60-70 cm GX-S800 - 24 watts 778 mm 80-90 cm Voltage: 220-240 volts 50/60 Hz