Here in the UK many of the desk lamps I can buy nowadays take a bulb
with an Ediscon Screw fitting. Also many wall lights for outdoor use
(sometimes with a PIR detector) take an ES fitting bulb.
Until recently all I ever needed for a general purpose light bulb was
a bayonet fitting. Now ES fittings seem to be appearing!
Pictures:
http://www.bltdirect.co.uk/base.htm
Is there a particular advantage of the ES fitting over the bayonet
fitting in these sorts of applications?