Wills 165W aquarium light is scientifically engineered to keep the PAR Output and coverage balanced. 2 Dimming channels, it can be freely dimmable the brightness of each group led and meet the different stages of your corals,reef and fish, which promotes the growth of any SPS and LPS flourished under it. Channel 1: Cool white(12000K),Warm white(3000K),Red 660nm,Green 520nm,Purple 420nm; Channel 2:Blue 450nm. Each led with a zener diode,to ensure the led works better,if 1pcs broken won't affect others. Secondary optical 90° crystal lens thereby to penetrate the depth of water. Dimension: 16'*8'*2.3'(40*21*6cm), Weight: 6.6 lbs. Perfect fit for depth 24' tank. Fit for less than 57 gallon. Max coverage area: 36'*36'*36'. Life Span : more than 50000h. Output: 165W (55Leds * 3W), Input Voltage : 85-265V. Main wavelength: white/blue = 3500K - 12000K / 440-470nm. Best service: 2 years warranty plus 30 days satisfaction or return guarantee,if you have any questions,please feel free to contact us,we will provide you with complete customer satisfaction.