Clear black iridium transitions lens have a stated range of 10-66%. My question (and sorry if it's stupid) is whether it's safe to still wear this lens at night for street cycling (as eye protection). OR would it be dangerous since letting in less light than clear. OR have I misunderstood the meaning of 66% and these lens do go 100% clear in absence of uv??? Any help appreciated. I've searched for ages online and here. Like others, looking to avoid spare lens changes.