These lights vary from the classic ‘backup on the side of the helmet’ to very high end products. Our main ranges come from Fenix and Petzl, both of which are reputable companies which produce reasonably robust products. We have tried to indicate broads spectrums of appropriate use as worked out by our own experience and customer feedback. There’s only one light on here that we haven’t tried out yet – the Duo S – it only turned up on St David’s Day!