... Lamp Type- II1.Using aluminum alloy as case and PC as lens, cold-resistant, ... high compression strength, and fire resistant.2.Intelligent chip control and two-stage filament ... 3.20,000 hrs of serve with protective circuits for over-voltage, under-voltage, ... tube protection.4.High frequency sine-wave current drive and no flash to ... lamps suit for SMEST DC/AC ballasts.Note:For above, lamp length, tube number ...