2gx13 22w 60w ring fluorescent bulb master tl5 circular philipsring shaped fluorescent bulbs with 16mm bulb diameteradvantages slim bulb with only 16mm diameter allows for the development of extremely flat lamps high light yield of up to 83lmw good colour reproduction level 1b rcharacteristics super 80 light colours 3 band light bulb specially developed for operation with electronic ballasts guaranteed ignition from 15c to 50c amalgam technologyusage allows for the design of