on 22/10/2017, Jeff Layman supposed :
The trouble is that they are sold as low-power replacements for halogen
bulbs, to be used in the same fitting. Halogens have a pretty-much 360 degree
beam, and it doesn't matter too much how the reflector is designed. But put
an LED in the same reflector, and you usually have a problem.

You can specify 'corn-cob' LED, which has light output around the
entire lamp, except the base.