Saw your inquiry and the response you had. Chroma 50 is a General Electric Brand Name. We can supply these or any number of equivalents. Please feel free to call us Toll Free at 1 800 BEST BULB and ask for Matt Collins who is our product expert. We also carry a full line of lamps for aquarium use (fish or other) as well as color corrected full spectrum lamps. Regards John Roberts Marketing Manager