WN 737 landing lights

Date:         16 Aug 99 22:28:08 
From:         boeing707@bellsouth.net (boeing707)
Organization: AT&T WorldNet Services
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I work for USAirways in FLL. Recently, I have seen Southwest 737
(models -300/-500 and the -700) landing lights blinking on and off
during their approach. Have only seen it on Southwest.
The entire set of landing lights on the wings alternately blink on and
off. Then when the airplane nears the inner marker, the blinking stops
and the lights are on steadily.
I have also seen this on a few Falcon 30's and Lears, but WN is the
only airline I've seen this on.
Can anybody give me the story on the blinking landing lights?
And, doesnt it lower the life of the lamp?

Thanks
Ken Smith
boeing707@worldnet.att.net
Ft Lauderdale, FL