How to place the appliance for a best killing result?

To place the insect killer in the environment where human often live would be the first principle. For attracting those pest active during day time, preferably to place appliance in the dark shade rather than under sunshine. Such placement is for avoiding appliance's UV light be weaken or repelled by sun light, since the sun light is extremely much stronger than UV light, so it will be more effective to attract pest in a dark environment. Meantime the moon light or some other artificial light source also will obstruct insect killer's light. Therefore it better to place it without other light. If we would like to place several insect killer in a same area, we must consider fixed coverage of appliance to maintain enough interval. For example the interval should be around 20 meters when the fixed coverage is 10㎡. Better not to hang it on a light color wall because the surface will reflect lights and obstruct insect killer's UV light. Neither to place it in a windy field. A suitable height 2-3 meters can help attracting better, and please never try to place electrocute insect killer in gas station or oil storage.