UV light traps - how far above the ground?

[Chris Raper]

>If  you believe the literature, moths respond to lamps at a distance of from
>10-25 m.
 
Hi Tony
 
I think the distance increases quite considerably when you are using
extremely powerful lights. In French Guyana (OK, yes - I've been there
too, but at a different time to Orville) we used two 150W bulbs at
head level with a ~400W bulb at the top of a tall poll. The theory
goes that the top light brings them close and the lower lights & sheet
draw them down to a workable height. This lighting rig illuminates a
very wide area and we could see moths moving in following a straight
line from at least 40m.
 
Best wishes,
Chris R.
 
 
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