these things are made to kill mosquitos and moths, the common house fly does not react to uv light of this wavelength at all. they go more after smells, you should use sticky pheromone strips for these. also, these bug zappers tend to pop insects, aerosolizing their body fluids, spreading them over quite some distances as a fine, invisible mist, spreading bacteria. i would not want to have that hanging above my head. i have my bug zapper near my window, far away from everything to intercept those mosquitos before they even come close to me. but as i said, these things are not suitable for house flies.
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