Letters to the Editor
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The rocky path to enlightenment
Low energy lighting is rapidly developing technology, so it pays to be astute in joining the rush. CFLs make a good choice for the interim, particularly for high-use areas. Warm white, or soft white produce a more pleasing light than cool white, but are less efficient.
LEDs are probably the best long term bet - efficiency is improving rapidly, and cost falling. It doesn't make much sense to pay high prices for LEDs now; equivalent globes will cost a fraction in a year or two, and choice of light fittings will be much wider.