12inch length bulb，Please confirm the light bulb size before ordering. 40W bulb compatible Flowtron,Stinger and other brand machines uses 12 inch length,GX10q type 4-Pin Base, U shape light bulb. Professional black light blue bulb with high intensity 365nm peak wavelength. Long Life Span: Light Bulb life average 6000 hours. If light transverter/ fluorescent starter failed, it will cause bulb not work. Please consider change fluorescent bulb starter.If any question, Email us will get a reply within 24H. 12 inch 40W(BF150) Fluorescent Replacement bulb Compatible for: Flow/tron BK-40BK-80CBK-80DGL-2400FC-2600FC-4400FC4410FC-4800FC-4810FC-4700 FC-7200 FC-7600FC-7800FC-8800 PM-2040A; PM-2080; MC-9000 Dyna Zap DZ30200 (1 bulb) & DZ30300 (2 bulbs )Sti/nger and other brand machines uses 12 inch length U shape light bulb.