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jeffh (44 spectra and 7 sets) | RSS | Public Lab profile »



Signed up: over 9 years ago
Tags added: 131

Laser wavelength and fluore...

jeffh | 2 spectra | 0

To show the importance of laser wavelength in producing fluorescence, I illuminated the same semi-transparent plastic cap from a yellow highlighter with 405-nm (violet/blue) and 532-nm (green) lase...


Low blue fluorescent bulb

jeffh | 2 spectra | 0

This compares a standard compact fluorescent bulb with one of the same size and nominally the same 13-watt power draw that is marketed as low blue light, to avoid blue illumination that can disturb...


Asus 27 inch sc...

jeffh | over 9 years ago

Small LED flash...

jeffh | over 9 years ago

LED flashlight

jeffh | over 9 years ago

60 watt incande...

jeffh | over 9 years ago


LED lamp throug...

jeffh | over 9 years ago

LED lamp throug...

jeffh | over 9 years ago

Another side vi...

jeffh | over 9 years ago

Side view LED bulb

jeffh | over 9 years ago


Cheap LED bulb,...

jeffh | over 9 years ago

Green laser

jeffh | over 9 years ago

another test

jeffh | over 9 years ago

White LED flash...

jeffh | over 9 years ago


CFL calibration...

jeffh | over 9 years ago

Calibration tes...

jeffh | over 9 years ago