A lighting device for an aquarium includes a sealed waterproof lamp shell and a light string arranged and connected with LED lamps, the light string positioned inside the sealed waterproof lamp shell. Select LED chips (4r,4g and 4b) shooting red, green and blue light respectively, which are assembled or directly inject-formed into an integrated LED lamp, synthetic light shot from the LED lamp is slightly reddish violet, luminous flux Φ for three base colors red, green and blue are respectively Φr from 32% to 41%, Φg from 47% to 54% and Φb from 12% to 14%. Illumination effect is improved for the aquatics, and ornamental effect is enhanced.
