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http://www.getstarshower.com/?uid=D3BC8E1884C8DA72426B90329025B568&gclid=CInx4NnW1McCFUzmfgodTswDrQ&gclsrc=ds:wtf: http://www.youtube.com/watch?v=gRaTgfnuI14 Yesterday I saw this TV commercial for a plug-in device that looks like two lasers, red and green, with a "stars" attachment...

This is one of the trickier colors. We see yellow when the red and green cone-cells in our eyes are equally stimulated (after automatic adjustments by the neural circuitry). However, the relative sensitivities of the green and red cells varies with brightness. As a result, yellows that trend...

What is the wavelength of pure violet?

What is the wavelength of pure orange?

:wave:I've been here for a few months but never got around to introducing myself. Ever since I was young I've been interested in science, reading Scientific American and the sort of books they advertize. I had a brief interest in lasers in the 1970s, but never followed up on it until now. I am...

No photos (no camera). No laser power meter. No spectrometer. No multi-tester. This is what I really wanted but couldn't afford: (a real 1W 447nm blue laser pointer with massive copper heat sink)...

This story just broke overnight. The pilot in the Asiana Arilines disaster at SFO says he was blinded by a bright light when he was at 500 feet. According to the black box (and the NTSB) that was when the problems began, with various autopilot buttons getting pushed all over the place. The news...

I suppose I could go as high as OD2, but only if they're underspec.

17 days ago I ordered a 200mW 808nm laser from O-Like. (High Power Infrared 808nm 200mW laser pen /burning [OL-H808-200] - $36.99 : Zen Cart!, The Art of E-commerce) It arrived today. I put in two AAA batteries, Walgreens generic alkaline. (The ad says 2xAAA) The second battery doesn't quite...

780, 808, 980, 1064, 1342? Sensitivity of the human eye when viewing ordinary objects illuminated by a standard lamp simulating northern daylight at midday at 45° N latitude. scotopic (night) vision nm sensitivity 380 0.000589 385 0.00111 390 0.00221 . . . 500 0.982 505 0.998 507 1.00 510...

5mW would be fine. :can:

I need it for evaluating diamonds for fluorescence. The standard reference wavelengths in the diamond industry are 254 nm and 365 nm. However, 254 nm is only used to determine what kind of diamond it is (type IIb, etc.) while the fluorescence measure that goes on the certificate is based on 365...