I plan on making a replica of a Las-7 Dagger from the game Helldivers 2, and I want to know if it might be dangerous to look at the spot on the wall. For this build I plan on using an 80w COB light, and to imitate the fact that its a laser weapon in the game, id like to collimate the light so that it looks like a laser. But now I'm worried that an 11,000 lumen 1 inch dot on a wall might be dangerous to look at. does collimating the light add any more danger then it would otherwise already be? I'm aware that a 11,000 lumen led that's smaller then my palm is already dangerous for how bright it is, but does collimating it into just a dot make it more dangerous? For reference, the dot would be roughly the same size as the LED itself, the collimating lens would be the only lens in the system.

Airy disktelescope

Resolving power is the capacity of an instrument to resolve two points which are close together Even an ideal lens without any aberrations cannot reproduce an object detail. Diffraction will limit the resolution possible. The smallest achievable spot from a lens is called Airy Disk. The radius r of the spot is given by wavelength λ and numerical aperture NA: r=0.61λ/N.A. r=The radius of Airy Disk ＝Resolving Power The longer wavelength of the illuminating light has larger spot. ex) A lens with N.A.0.07 at wavelength 550nm ｒ=0.61×0.55/0.07=4.8μm

Airy diskformula

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