After I installed the two quite punctually delivered tubes initially I was pleasantly surprised by the luminous efficacy - which was higher than that of the fluorescent tube used previously. After about 5 months, however, began one of the tubes to flicker and then put a short time later the operation completely a. The tubes are / were rarely in operation (basement). Communication with the seller is impossible. (Sits somewhere in China) An exchange on guarantee, I really expect at a price of about 12 per tube, completely ignored.
Conclusion: If the parts are working permanently everything is ok, otherwise unfortunately (continental) China quality.
