I use a 125W Mercury Vapour lamp in conjunction with a white bedsheet for attracting night-flying insects (hence the background in these images). I used to set this up on my apartment rooftop or balcony with the sheet as well as the surrounding tiled or painted walls as a base.
I found this fairly limiting due to often small numbers of attendees and usually the same species. So now I have invested in a gasoline generator and take my gear into the bush strapped to the back of my trusty electric bike. The upside of this is an endless variety of species of all sizes, not only moths but from across the arthropod range; the downside is being totally overwhelmed by the sheer volume of insect life to the point where getting settled on the sheet is difficult due to a constant barrage of disturbances, disrupted fields of view for a clean photograph, and predation (an army of predatory wasps and mantids require employing your peripheral vision to be aware of your prize model potentially becoming dinner).
The hard decision is usually deciding when to pack up and go home, just in case that “amazing one” arrives…..