In article ,
Harry Bloomfield wrote:
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.

These seem to be less efficient than single LED units.

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Dave Plowman London SW
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