MORE INFORMATIONS for laser protective goggles and IPL protective goggles:

there are some issues decide the burning effect and the bright of lasers:
1. wavelength: normally the shorter the wavelength is, the stronger the burning effect is. for example, comparing with those three lasers at the same output, 405nm > 532nm > 650nm. but for bright, 532nm >660nm>405nm
2. output: everybody knows that output is the most important issue for burning if they are the same wavelength.
3. lens: laser ls is expanding lighting, only when it work with focal lens, the heat can be focused on one dot, the heat is the best
4. fl–focal length: normally, fixed focal lens laser get fl on 3-7cm. the heat in those area is the best. fl of a focusable laser can be adjusted, you can focus the laser dot at the the smallest to get the best heat.
5. usage/beam diameter: lab and stage lighting normally get bigger laser dot, the burning effect is less than laser for engraving. normally, laser for lab/stage lighting is about 1.5mm, but laser for engraving is about 0.8-1mm
6. lens: glass lens is better than plastic lens

1.  IPL laser protective goggles, it can work for nearly full wavelength by laser which human eyes sensible. as you know IPL uses lower power laser for full wavelength. some IPL machines can cover blue, yellow, green and red laser. but the output of them is no more than 10mw. so that this goggles is suitable. but this machine brings a problem. ALL sometimes is not as good as unique. acturally, we do recommend people buy laser protective goggles according to their wavelength. for example, if your laser is 808nm, we recommend a 808nm goggles. this kind of goggles works best at this wavelength.  but if you buy a full wavelength goggles, it may be not as good as a spedial wavelength goggles.
2. for the T: some people do not know what the T mean, T here means transparency. for a special wavelength goggles, a T=30% means there are 30% laser can pass through. for a full wavelength goggles, T here means an average level. as you can see in the picture, when you use a 405nm laser for the goggles, there are about 30% can pass through. if you use a red/green laser, there is about 50% pass through. if we use a 1064nm on the goggles, it is about 20%. so that we get an average value for T=30%.
a customer of us said, a laser goggles should be T=0.01. if T here is 0.01, how you can see the laser beam path? for T=0.01, we have IPL goggles for patient: http://www.ebay.com/itm/Eyepatch-Glasses-Laser-Light-Protection-Safety-Goggles-IPL-Beauty-Clinic-Patient-/111003193327?pt=LH_DefaultDomain_0&hash=item19d84e4fef. here T=about 1-2%. but this kind of goggles will block all laser light. you cannot see anything if you wear it.
3. for CE certificate, a customer of us said he need a CE certificated goggles for IPL, I recommended this one, but he doubts the CE mark and said that everyone can mark the CE logo on it. for this experience, I do not know how to reply his message, if you doubt the CE certificate, please do not buy it. we have goggles without CE mark, the price is much more cheaper. so that it is meaningless for us to mark something if we do not have it.
4. for the OD: OD means obviouse density. normally the higher OD the goggles is the better protective effect it can be.

in conclusion:
1. if you need a burning laser, we do recommend a 405nm laser + focusable + glass lens + 100mw
2. if you need a laser for bright light and stage lighting, a 532nm laser 50mw is enough. or a red one for 80-100mw. or a 450nm 100mw.
3. some instutute use laser for inspecting molecular structure, I do recommend 473nm laser. normally a 50mw analog is ok. the output is 50-90mw. a 405nm 150mw laser can be option.
4. laser less than 5mw for handheld will go with FDA license, it is safe for teaching point. but if you need a laser can point the star for antonny use, a 532nm green 100mw is recommended.
5. for IPL laser, we do recommend 638nm/650nm more than 200mw, 591nm, 445nm.

some basic issues for IR lasers (700nm- )

IR laser is normally used for night vision. so that the laser light cannot be seen by human bare eyes with DDC/infrared camera. 97-99% of the light cannot be seen, but there is 1-3% red bomb can be seen by your bare eyes.
but you can point it on a white paper and use your camera to check whether there is a pink rectangle/ellipse dot on the paper.
or point it to your phone camera to see whether there is light–white or pink.