Sodium Lighting

I want to put some exterior lighting round my house and I was looking at some sodium lighting units. The price difference is huge compared to standard lighting. Anyone know why?
Tony
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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).
--
Andrew Gabriel

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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 B&Q etc.
Mark S.
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