Welcome to Laser Pointer Forums - discuss green laser pointers, blue laser pointers, and all types of lasers



Laser Pointer Store

Survival Lasers 405 / 445 x-tension tubes?

JBTexas

New member
Joined
Jun 5, 2011
Messages
545
Likes
11
Points
0
Thanks for the test. It's nice to know that if I WANT TO, when I get a SL-445, I can have it go <= 100mw (for whatever reason).

Going back over the thread... it occurs to me that the 445 with 1x battery might drain the battery very fast. "Red Flag" / caution.

The eye thing... I've read the "Blue Light Hazard" material on the web. Maybe it's that "reverse bleaching effect"? And the short wavelength... our eyes just weren't designed for pure short wavelength light, and we get weird effects.
 

InfinitusEquitas

Well-known member
Joined
Mar 27, 2011
Messages
16,032
Likes
909
Points
113
Thanks for the test. It's nice to know that if I WANT TO, when I get a SL-445, I can have it go <= 100mw (for whatever reason).
I wouldn't jump to that conclusion based on my test. I don't know whether the driver in my laser is the same as the one Gary uses... You will get a lot less power, how but, apparently can vary quite a bit.

As for the blue light hazard, I'm well, aware, the distance and output both make it perfectly safe to stare at the dot... but I just find out of all the wavelengths I've seen so far in person (5 of them) 445 is the most uncomfortable to me for some reason.
 

Lotus_Darkrose

Well-known member
Joined
Feb 19, 2009
Messages
1,859
Likes
91
Points
48
I just find out of all the wavelengths I've seen so far in person (5 of them) 445 is the most uncomfortable to me for some reason.
You're not the only one lol. It puts the most strain on my eyes second only to shining my 35W 7-8000k color temperature HID in my room. (I had to while setting the focus just right for the reflector).
 
Last edited:

Helios

New member
Joined
Jan 7, 2011
Messages
1,341
Likes
58
Points
0
405nm gets me the most. I cannot make out the dot at any sort of a distance. It always looks large and really fuzzy even with only 50mW but when I get close I can see its a circle. Gives me a headache some times even.
 

InfinitusEquitas

Well-known member
Joined
Mar 27, 2011
Messages
16,032
Likes
909
Points
113
405nm gets me the most. I cannot make out the dot at any sort of a distance. It always looks large and really fuzzy even with only 50mW but when I get close I can see its a circle. Gives me a headache some times even.
No headaches, but I know exactly what you mean about the fuzzy dot... I can't focus mine without goggles either.
 

Garoq

Well-known member
Joined
Aug 27, 2010
Messages
1,455
Likes
250
Points
83
Thanks for the test. It's nice to know that if I WANT TO, when I get a SL-445, I can have it go <= 100mw (for whatever reason).

Going back over the thread... it occurs to me that the 445 with 1x battery might drain the battery very fast. "Red Flag" / caution.

The eye thing... I've read the "Blue Light Hazard" material on the web. Maybe it's that "reverse bleaching effect"? And the short wavelength... our eyes just weren't designed for pure short wavelength light, and we get weird effects.
I agree that the exact output with the single 18650 is highly dependent on the voltage of the battery as well as the characteristics of the particular diode, as you and others noted.

Also agreed that the eye does not focus the shorter wavelengths well. I remember when I was in high school that there was a blue light in our school auditorium and when the lights were dim it always appeared fuzzy.
 
Last edited:




Top