*IMPORTANT SHIPPING NOTES: After adding correct lamps to your shopping cart please visit our "Shipping Fee Schedule for URI VHO Lamps" page for important information on shipping surcharge. Super Actinic R 420nm VHO Fluorescent Lamps By UV Lighting Co. The Super Actinic R is the most widely used aquarium lamp on the market. This lamp has a 100% blue spectrum with a peak output around 420 nm. This closely resembles the blue chlorophyll absorption peak utilized in photosynthesis. The 180 degree internal reflector allows for 40% more light output. Great for reef applications and coral enhancement. 180º internal reflector allows 40% more light output. Excellent for all marine and reef applications. All URI lamps come with 180` internal reflector which allow 40% more light output. Available lamp Sizes: 24"(75W), 36"(95W), 46.5"(110W), 48"(110W), 60"(140W), 72"(160W).