Flourascent Lamps has categorised into those products as per LEDVANCE:
T8 (26MM DIA) and T5 (16 MM DIA)
Click to go another LEDVANCE Series : GLS Lamps | Main Voltage Halogen | CFLi Lamps | CFL Pin Lamps | High Pressure Discharge Lamps | Classic Series | Spot Series | OTC Luminaire Series | EC Series