Independent grocer Levi Beachy, owner of Beachy???s Bulk Foods in Arthur Illinois, increased customer traffic, overall sales and the amount of individual purchases when he moved from a small, poorly lighted outlet to a 6,000 sq. ft. store illuminated with a dozen DayStar skylights. ???As a store owner, I have employees, inventory and other things to worry about,??? Beachy said. ???The one thing I