This Zoo Med lamp contains a 50/50 combination of 6500k trichromatic daylight phosphor and actinic 420 phosphor in the same lamp. Ideal for marine aquariums, reef aquariums, African cichlids and discus fish. Provides high intensity full spectrum, illumination, strong in the short wavelength blue region. Essential for photosynthetic corals and invertebrates, balanced with 6500k daylight for natural color enhancement and viewing pleasure. Long lasting: Effective for up to 10,000 hours.