I'd still say these are going to pick up enough scratches to effectively block out most light. Or, at least, that's the way my brain wants to think about it. Like the way headlights get dim over time because the plastic or glass casing picks up scratching and makes them hazy/foggy/look like sea glass. I'm not trying to suggest that's what will happen so much as trying to understand why it wouldn't. Even with the street sweeper hanging under the cow catcher, the bristles of the broom seem like they'd scratch the surface over time and limit light. I'm very certain much, much smarter people than me designed this and have accounted for those issues. I just... Don't grok how lol