[RFI] Repeater Desense from Tower Light? Or what is it??

[k9mk at flash.net]

Greetings to the group,

    Last night I was monitoring our county skywarn net on 2M as storms went through our area.  On a number of the marginal stations, the ones that were in that 'almost full quieting' signal level into the repeater I observed what I thought was a desense hit.  That meaning  where the signal went from almost full quieting to a bit noisy (> 20 dB quieting).  It would toggle up and down and then I realized that the so called desense had a cadence.   About one second on and then maybe 2 seconds, or something like that.  I quickly realized it the was tower light.  Has anyone seen this or maybe dealt with something like this?  The light and antennas are at 400', and the repeater is in the bunker at the tower base.   Thanks in advance.

73  Mike  K9MK