Wednesday, November 24, 2021
Tuesday, November 16, 2021
|Photo from MSHFA|
Thursday, October 28, 2021
This photo is of a streetlight maintenance vehicle owned by the Philadelphia Electric Company in 1910. Just one more application specific tool who’s time has come and gone. Eat your heart out manlifts everywhere!
If you happen to have any cool photos of old-school lighting tech we would love to see them!
Thursday, October 21, 2021
Thursday, September 2, 2021
article in the latest edition of Lighting Research & Technology offers the possibility of an interesting out-of-the-box option.
The article, in general, poses the idea of illuminating highly sensitive objects with what it calls “selective chromatic lighting”, which amounts to lighting an object with only the wavelengths of light which would be reflected by that object. Essentially, we are talking about lighting an object with a high resolution photographic projection of the object itself to reduce damaging light absorption.While, in practice, this may be prohibitive on a large scale for multiple reasons, on a small scale it does pose some interesting possibilities. Imagine, for example, that you had a highly sensitive handwritten letter, black ink on paper, which would ordinarily be limited to 30 lux or less. The concern, beyond a yellowing of the paper, would be the fading of the pigment in the handwriting which would reduce the legibility over time. The possibility posed by the article is this: What if you illuminated the letter with a high definition photograph of the letter projected from an LED light source and aligned with the original. Then, for all intents and purposes, you are only illuminating the empty white page and minimizing the light which would fall on the text itself. While certainly not an everyday solution, it is one which current technologies make much more conceivable than in days gone by.
If you have some time we recommend the article. A link to the abstract is provided below.