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Originally Posted by Madhatter
or mercury vapour , which is white like halogen.
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Metal Halide provide a nice white light and are efficent. They are a discharge type light so take a few minutes to warm up. They can usually be used on SON gear so can be used as a direct replacement. Many of the new street light fitted around us are now white and I suspect they are using metal halide lamps. Only problem for home use is they are quite expensive compared to a £5 150w B&Q halogen light fitting with PIR.