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Another significant downside is the raw size of a bank
of LEDs. A bright filament is nearly a point source of
light, given the distance from the lamp to the stage.
This means that the lamps can be far away, but still
aimed precisely and even made to have defined edges.
LEDs are directional, but it takes a lot of them
side-by-side to make a bright light, and so the light
ends up being diffuse. This is sometimes an advantage,
but often isn't. There are some work arounds, but if
the light needs exact placement, LEDs don't work well.