| abstract |
An ultraviolet light source comprising a radio frequency energy generator 60 connected to two separate electrodes 30 and 32, the electrodes arranged to excite at least one ultraviolet bulb 10 with RF energy. At least one of the electrodes, preferably both, are optically transparent, and are arranged so as to substantially surround the bulb. This is achieved by forming the electrodes of an optically transparent material, or of an electrically conductive grid/mesh. The UV light source is particularly suitable for use in the sterilisation of substances; the promotion of photochemical reactions; and the promotion of molecular dissociation in liquids. Also disclosed is an electrodless ultraviolet bulb containing a vapour which emits UV radiation on excitation, and provided with a spur or protrusion shaped for receipt of means for cooling the vapor (see figures 11 and 12). |