Prolite presents this 4W ST64 Squirrel cage lamp produces a vibrant yellow output (equivalent to approximately a 20W coloured incandescent). It is ideal for use as effect lighting thanks to its fully dimmable functionality (recommended to use Varilight V-Pro dimmers). The lamp dimensions are 140mm long by 64mm in diameter featuring the standard Edison Screw (E27) base type. Prolite have designed this lamp with an average lamp life of roughly 25000 hours ensuring savings over the course of its lifespan due to its low energy consumption. Please note this lamp is designed for 240V mains only.