Place like Maplin sell Anglepoise-style magnifier lamps, like this.
Apart from the magnifying lens, which is useful at times, they have a circular fluorescent tube, which is usually of a high colour temperature and produces a very clear, intense, white light. I find it very 'sharp' to work on small items with.
Do remember to cover the lens, when not in use, if there is any chance of sunlight reaching it...