There's a reason why century-old approaches to lighting are still in common use on film sets. A casual survey of the trade press over the last five years or so might easily give the impression that LEDs are the only game in town, but the reality is that there are at least four major artificial lighting technologies used every day on film sets around the world, plus a small selection of special-purpose tools. The cost of lighting rental is trivial to high-end productions, so there must be a reason why they're not using LEDs exclusively, especially since LED fixtures so often elicit claims of high efficiency and enormous equivalent output power. Regardless of the reliability of those claims, knowing what works best, and in what way, lets us make better decisions about what to use, or even what to buy.
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