Running costs are very low (including relamping costs).
In the circumstancies where they are normally used, that
is the primary concern, and they are not sold into markets
where the purchase price is a particularly sensitive area
(installation cost will normally swamp that).
Because they are nomally used in people's lofts and spare rooms for
growing tomatoes.... ;-)
They take a while to warm up (streelights) so if you came out of the
door you'd still be in the dark. They get very hot and close up the
light output is very strong. The bulbs themselves are expensive and
as they need a ballast to power them the costs of each unit add up
making them expensive compared to say a 150W cheap security light from
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