Abstract
Illumination engineering is a nascent field in the broader category of optical engineering. The what, where, when, and who leads us to why illumination engineering is now a field in demand. This introductory talk to this year's Nonimaging Optics and Efficient Illumination Systems IV conference touches briefly upon the former queries. It ends with a discussion of the monetary dynamics, especially commercial products, electricity costs, and forecasts for the future.
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