The slim, low-profile Aqueon OptiBright Plus LED fixtures are LED lights ideal for freshwater or marine fish-only aquariums. For freshwater planted tanks choose the OptiBright MAX, or if you also want WiFi/Bluetooth control choose the OptiBright Smart. The OptiBright Plus comes with an RF remote control with 24-hour timer. The fixtures also include adjustable legs that can be extended to accommodate multiple aquarium lengths. 18-24", 30-36" & 48-54" versions. Useful Links:Planted & Fish Only Tank Lighting ChartIWhat are Wattage, Lumens, Lux and PAR?IGetting the Most out of Your Light.