hi.i made a set of chest light.the switching time is 13-15 seconds between the two modes.
here are some pics:
http://sphotos-b.ak....425960947_n.jpg

http://sphotos-d.ak....499159362_n.jpg

http://sphotos-g.ak....051990679_n.jpg

http://sphotos-a.ak....862230861_n.jpg


ATAt chest light - YouTube


i make 5 sets for 70$ plus shipping