A 100 square clothing store, 2.9m high. How many LED downlights (7W or 9W) need to be installed, and what is the spacing? Except spotlights and high cabinet light bars.

First, check that the latitude of Jinan is 36.4, and the angle of Tropic of Cancer is 23.26, which is the shortest sunshine time from winter to morning.

Building area without shading = tan (36.4 23.26) = 1.708 * height * floor difference br/> =1.708 * 2.9 * 21

=104m

The building area should be 104m.

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