Blacklight uv energy saving lamp blacklight, ultra violet lamp, low energy bc/b22 bayonet fitting high uv light intensity 20w light bulb with standard lamp fitting. Fits into most standard light fittings as a direct replacement for conventional bulbs. Produces a deep purple "black light" with large amounts of ultra violet light. Uv is reflected by white and lightly coloured clothes and fabrics making them glow in the dark and fluorescent materials and dyes light up. Specification: power supply 240vac, 50hz high power 20w. b22/bc bayonet cap. Features: energy saving bulb. Saves up to 80% energy! fits into a standard lamp fitting. lasts up to 8x longer than conventional bulbs. Note: this product is unsuitable for use in dimmer lights.