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How much light do sun tunnels let in?

How much daylight your sun tunnel lets in depends on a number of factors including roof orientation (i.e., the south is always best), tunnel length, tunnel angles, time of day, season of the year, etc.

Generally, however, the 10" and 14" diameter sun tunnel models are best for lighting any room in your home. And due to their rigidity, the same size rigid tunnel will transmit more light than a flexible tunnel of the same size, length, and configuration.