Sunlight gives us light at no charge, which we can harness in our buildings to reduce our reliance on electrical lighting, while providing a more enjoyable indoor environment. Leave it to an engineer to tell us how much that sunlight actually costs us. Lumens per watt (lpw) is the measure of lighting efficacy, telling us how much light (lumens) we get out for how much power (watts) we put in. The chart below shows typical efficacies of different lighting technologies, including incandescent (14), LED (30–50), T-5 fluorescent tube (95), and more.
Now, having made that snarky comment about white guys in a previous post (for the record, I'm a white guy), I should say that the conference itself has a very nicely diverse attendance. Walking the trade show floor, you're surrounded by a range of ages, what seems like an almost even mix of sexes, and a good variety of ancestries. And not everybody is dressed in fashionable black with high-tone glasses.
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