You wish to do this without VdE device approval, “Laserschutzbeauftragter” certificate, and German legal framework OStrV /TROS.?
Nice words I've learned from my German friends at Laserfreak.de and industry conferences.
Daylight laser has to overcome irradiance of 900-1100 Watt Per Square Meter to a daylight / scotopic eye which is already desensitized and iris stopped down. That needs a bright laser, and possibly (if not certainly) lasers in airspace clearance in case you scan past a target at that power level. . Not to mention text is anything but efficient at power conversion. Problem is surface has no means of contrast enhancement to help you.
I suggest you check your regulatory framework, and wallet size, and have friends on site who are fire-fightsers. . Not to mention finding very fireproof walls to project on.
That is one task direct view LED Walls will always excel at, even though I hate LEDS. Contrast enhancement in the led module physics makes it possible at far less power per unit area of light.
You would need a very tight laser beam for this, at 30 watts or more. Must be a direct yellow or direct green laser, as those are the colors at the peak of vision. Most low cost 30 watt lasers are diode arrays with very fat beams. Energy density is low , but hazard is still very, very high, energy density per unit area is much lower then desired. Investing in 30 Watts of used OPSL laser will be 60,000 USD or more, your alternative is the ancient Ion Laser, and I assure you , that is not the way to go.
Buy a LED wall, or used LED traffic sign, with tradeoff on viewing angle, and be happy.
At night is a different story. Dark adapted eye is orders of magnitude more sensitive, and loves coherent light stimulation. Daylight eye, no where near as much. Laser excels at night.
I understand what you are trying to do, but if the problem was that easy, everyone would be out doing it.
Steve
Last edited by mixedgas; 06-07-2023 at 14:21.
Qui habet Christos, habet Vitam!
I should have rented the space under my name for advertising.
When I still could have...