I get that the sun is huge energy source, but it is so far, and the light from bulbs is just as bright as the sun
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Other have correctly said that light bulbs are less bright than the sun, but we usually use them in rooms that would be dark. If you take a light bulb outside on a sunny day, you will notice that it is not nearly as bright.
In addition, modern light bulbs (“plastic” LED and “coiled” CFL) are specifically created to avoid generating heat, because it wastes energy and makes the bulb burn out faster.
Old incandescent bulbs (metal coil inside a glass bulb) generate quite a bit of heat, and can be used to keep (small) plants or animals warm. E.g. turtle enclosures needs a “warming” light.
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