This is a Tridonic 1/2x 26-42 TC Pro
- HF ballast can run 1 or 2 x 26w double or triple turn compact fluorecent lamps, 1 x 32 or 42w triple turn compact fluorescent lamps, 2 x 18w long single turn or f shaped compact fluorescent lamp, 1 or 2 x 22w T5 circular lamp, 1 or 2 x 24w f shaped compact fluorescent lam or 1 x 40w T5 ciruclar fluorescent lamp. Tridonic article number 22176408