Blu-ray beams?

[Marcusss]

What power is needed for a decent beam

-In daylight
-At night

Kind regards
Marcus

 

[Deleted member 8382]

It depends a lot on what your concept of decent beam is. If you want something near a 5mW green pen, you're looking for at least 200mW of bluray (even more maybe).

I wouldn't expect to see a blu-ray beam in daylight.

 

[Rob]

Yeah you're not going to be able to see a Blu-Ray beam in daylight. I can see my 180mW beam at night somewhat clearly but if you're looking for the same visibility of a green laser it's just not going to happen.

 

[Marcusss]

Ok thanks for the input that more or less sums it all up

 

[davidgdg]

Bear in mind that for a blu ray beam or spot to have the equivalent apparent brightness of a green beam or spot, you need one thousand times the power. So what you are asking for is basically impossible. Sorry!

 

[rtyrty100]

Bear in mind that for a blu ray beam or spot to have the equivalent apparent brightness of a green beam or spot, you need one thousand times the power. So what you are asking for is basically impossible. Sorry!

Probably around 45x the power, not sure if you were being exaggerative on purpose though, but yeah, same point. Its HARD to get that.

 

[nikokapo]

A long wavelength PHR-803t will do the job

 

[ProjMan]

By the math, the eye is about 180 times more sensitive to green than to 405nm violet. However, atmospheric Rayleigh scattering will reflect 405nm about twice as effectively as it will reflect green. Theoretical beam visibility for 405nm, therefore, is about 90 times worse than for green.

5mw of green produces a beam that is minimally visible in darkness. To get an equivalent effect from 405nm will require about 450mw. Theoretically.

 

[Marcusss]

Grrr I have a 204mw or so D:

 

[yobresal]

My >500mW violet looks amazing at night equal to 5mW of green if not more so.