• breadsmasher@lemmy.world
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    9 months ago

    The lamp in the mirror is a reflection of light from the real lamp. The real lamp is producing light. The mirror lamp is a reflection of this light. The reflection doesnt add to the amount of total light

        • XEAL@lemm.ee
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          9 months ago

          Let’s define “more”.

          Yeah, we’re not troll sciencing light out of nowhere, but if the lamp is next to a mirror instead of a wall, the room will have more illumination, because the mirror is reflecting the light emitted by the lamp better than a wall will do.

          • P1r4nha@feddit.de
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            9 months ago

            All true, but there’s a reason for lamp shades as well, as they diffuse direct light and make the illumination of a room friendlier. Glare is a real issue and so while placing a mirror next to lamp increases the light in a certain direction it could be uncomfortable looking into the direction of the lamp. A white wall would reflect the light in a more diffuse and thus agreeable fashion, but the overall output measured in the room is gonna be smaller. Illumination depends on your needs in the end.

          • diverging
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            9 months ago

            the mirror is reflecting the light emitted by the lamp better than a wall will do.

            Will it? Maybe. You are making the assumption that specular reflection is better at reflecting than diffuse reflection, but that is a false assumption. It depends on the reflectivity of the wall and the mirror. A white wall can reflect more light than a mirror.