Use the first one. The second one sounds like it's lighter than ONE of the conventional ones - there could be others ones that it's heavier than.
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Grammar GeekIn truth, either will serve, but no one will think you mean that this one machine is lighter than all the other ones put together. That's so obvious as to be nonsense.Thank yo
My friends Tom is stronger than my other friends. No one would think that you mean Tom is stronger than all your other friends working together.