provide a water and vapor tight seal for cylindrical lighting bore 20 as the lens 50 is sandwiched between the o rings 51 and 65 suitable materials for o rings 51 and 65 include buna n nitrile and fluorocarbon such as viton u00ae elastomers as is evident from fig1 a lens cap 54 may include radially extending slots 68 in the exterior face 70 thereof by which lens cap 54 may be rotated to move inwardly to press against lens 50 and be secured to housing 12 further radially extending slots 68 provide outlets for light transmitted through lens 50 when led 34 is powered and personal light 10 is placed for example on a flat surface with exterior front surface 22 face down finally lens cap 54 provides a suitable surface for engraving of a product name logo or other graphic as shown at 72 referring again to fig2 a circular switch actuator bore 80 is formed in housing 12 parallel to circular battery bores 14 and to one side of lighting bore 20 as may best be seen in fig3 circular switch actuator bore 80 includes a first bore portion 82 of a first diameter and a second counterbore portion 84 of relatively greater diameter a coil spring 86 of an inner diameter greater than that of first bore portion 82 and an outer diameter less than that of second counterbore portion 84 is disposed in second counterbore portion 84 and rests on annular floor 88 at the.