[dogben]

Thanks. So that 30W lamp in another comment might be a safty hazzard if someone in close range stares at it and the beam is tightly focused.

[risenshinetech]

You're right.

While we're at it, we should make sure no one goes up to the massive speaker system and puts their ear right up to the speaker cone too.

[darkwater]

The beam is not going to be tightly focused, if it needs to cover a big chunk of a stadium at once

[krisoft]

Yes. The manual from the manufacturer recommends wearing specific green tinted safety glasses if you are standing closer than a meter to their transmitter while it is on.

[numpad0]

I guess this device can be modified to take visible red lights with some redesign, if you'll be really concerned with that.