On 1 September 2010, EU legislation comes into force requiring lighting to be labelled in terms of lumens, instead of electrical watts. Lighting manufacturers already measure their products in lumens, which is derived from the SI unit for luminous intensity - the candela, so current products are likely to continue to be manufactured as they are. However the new rules will make it easier to bring new products to market ...
Full story On the UK's National Physical Laboratory (NPL) website.
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