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Originally Posted by Neil
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.
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You are of course correct, and I was thinking that going up the motorway to the meet. they don't put sodium lights on the motorway do they, they're mercury vapour, the golden ones, and the crisp white which are appearing more often now, as i assume costs are falling, are metal halide.