This product has been discontinued by the manufacturer, please click HERE for replacement.   The Tridonic PCA 1/40 T5c ECO is a dimmable high frequency ballast to run: 1 x 40 Watt T5 Circular fluorescent tube This ballast has a dimming range from 3 - 100%

 

Alternative 

https://www.easy-controlgear.com/products/qti-dali-te-1-x18-57-dim-4008321060808?_pos=1&_sid=2f5e62056&_ss=r