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The amount of light required for indoor plants varies depending on the plant species and growth stage. In general, most indoor plants need at least 6 hours of direct or bright, indirect sunlight per day. Plants that require high light levels, like tomatoes and peppers, may need supplemental grow lights. Low-light plants like pothos and snake plants can tolerate dimmer conditions. According to the University of Minnesota Extension, adjusting the distance between plants and light sources can also help regulate light exposure.