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In the world of riflescopes, 'more gain, less strain' is not always the best policy. People who know about these things tell us that in high light conditions some high-gain 2nd generation models can become overloaded by artificial light sources, like street lighting, or even by a bright full moon.
High light conditions may reduce the life of the intensifier tube. A Generation 1 night vision scope might be OK if you will be viewing mainly on moonlit nights or in urban environments.