his Osram QT-ECO 1x18-24/220-240 L is a non dimmable matchbox ballast to run: 1 x 24w T5 fluorescent tube 1 x 22w T5 Circular tube 1 x 15w or 18w T8 Fluorescent tube 1 x18w or 24w Double turn CFL's 1 x 18w or 24w Dulux F CFL's
This product is now obsolete please click on the link below for viable alternative to 18W and 24W
If it is a 21W tube please order the
If you want the same but square
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