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Bio

Dan's mugshotDaniel H. Bennett was born in London in 1965 and lived in England until moving to the United States in 2000, settling in Northern Colorado.

His interest in vision and observation of the behavior of light has been life-long. On a trip to France as a young man his hosts called him “Monsieur Tête-en-l’air” (Mr. Head-in-the-air) due to his always watching for halos, rainbows, sun-dogs (parhelia), etc. He was particularly influenced by a book written in 1939 (published in English in 1954, Dover) by Professor M. Minnaert, called The Nature of Light and Colour in the Open Air. A Field Guide to Time-Varying Light Sources was conceived as a modern successor to that book, and adopts a similar approach, while revealing the secrets of modern light sources.

Daniel is married with four children, a motorcycle and two accordions.

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The Field Guide is available from Amazon and other outlets.

The book's front cover

ISBN-13: 978-069-236090-3

ISBN-10: 0-692-36090-5

LCCN: 2015900348

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The Blog

Here's my blog, where I'll write articles of interest, things I've learned, tutorials, suggestions for lights to go look at, musings, etc.

Sunday, 26 April 2015 16:41

Wonderful three-phase arrangement

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This is a slightly cropped region of a photograph I took at Indianapolis airport in March 2015. It shows a long building with pressurized sodium lights along the front. The cool thing to note are the regions where the traces show strong diagonal patterns to the light and dark dashes. This is due to the fact that the electrical contractor who wired up the lights was fairly rigorous in following a 1 - 2 - 3 - 1 - 2 - 3 sequence when selecting which phase of the three-phase electrical supply each light should be connected to. This is a sensible approach as it balances the load nicely. And, for those who know how to see it, it makes a cool pattern!

Lights on a building at Indianapolis airport
Unusually regular three-phase patterns
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2 comments

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All content on this website, including images, videos, text and material from "A Field Guide To Time-Varying Light Sources" is © 2015 Daniel H. Bennett / timevaryinglights.com / A Bear Peering Round A Rock, and may not be reproduced without permission. All rights reserved to the extent of applicable law. Exceptions: third-party images, which are credited as applicable, third-party embedded videos and public domain images.