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Answer:
The bulb which gives out heat like filament bulb. It helps to keep the egg warm (well eggs only hatch in warm condition).
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The type of light bulb used to incubate eggs are referred to as Heat filament bulbs.
Heat filament bulbs are different from other types of light bulbs in that it has
a very thin filament which makes it difficult to use up all the electric current
that passes through it. This then leads to the electrical energy being
converted to heat energy.
The heat energy generated is what is used by individuals to incubate the
eggs as they provide a very good heat and light source for the eggs.
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