Strange light

Flares have been haunting me for quite a while when taking pics at night
/ low light with bring light source. I have been wondering if it's a
lens problem, a dslr problem, or what. Then recently I found someone
discussing related (not the same) issue in dpreview.

Last night, I was taking some random shots again in YMT and saw the
green lights. I took some experiments and eventually took off the
filter. The strange lights disappeared... More experiments are needed
as I think inconvenient to take off the filter (well... many people
argue that filters are not needed at all, or in most situations). Some
suggested using lens hood (?) or smaller aperture, etc. Will try try.

Here are 2 samples. 1st one ("Killer_...") was with filter and the 2nd
one ("Killer2_...") without. Both taken using my D80, Nikon 35mm/2, B+W
filter.

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