Try going full dark adapted and looking at a full moon. It hurts. And that’s a light source only worth 1cd on the ground around you.
I think you mean lux, not candela. A common estimate is that the full moon is about 0.25 lux, though it can vary considerably. The moon’s intensity is a bit higher than 1cd; putting 0.25lux on Earth from 384400km away requires 36940840000000000cd.
That’s not to take away from your point; a well-aimed, focused light source with good cutoffs won’t blind people nearly as much as a diffused one will.
You are correct, lux, not candela. Got my alternate light measurements mixed up. Guess I was also off by an order of magnitude for it’s lux when full. Look, I can read paper under moonlight!
I think you mean lux, not candela. A common estimate is that the full moon is about 0.25 lux, though it can vary considerably. The moon’s intensity is a bit higher than 1cd; putting 0.25lux on Earth from 384400km away requires 36940840000000000cd.
That’s not to take away from your point; a well-aimed, focused light source with good cutoffs won’t blind people nearly as much as a diffused one will.
You are correct, lux, not candela. Got my alternate light measurements mixed up. Guess I was also off by an order of magnitude for it’s lux when full. Look, I can read paper under moonlight!