Please confirm the light bulb size before ordering. Length 7.5’’*Width 1.6’’* 0.95’’. 7.7’’ Overall length. FUL15W-BL Replacement Black Light for Flowtron BK-15D,BF-35C,Stinger U/V15, FP15, TZ15, BB-15WHT,Black Flag BB-15WHT HEMIUA T6 Pro,SEVERINO Zap T6 Pro,and other machines use 7.7 inch bulb. 4 pins cap on top of lamo,cap type Gx10q . Light bulb designed 6000-8000Hours lifetime, for best performance, we suggest replace it every 5000Hours. Professional Black light with high Intensity 365-368nm , multiple use and easy to placement. Friendly customers service with 90days return. 2 Pack FUL15W BL (BF-35) Fluorescent Black Light Bulb Replacement Compatible Flowtron BK-15D,Hemiua Zap T6 Pro,BlackFlag BB-15WHT,Stinger U/V15, FP15, TZ15, U Shaped Twin Tube Bulb for T6 T8 T9