Compact fluorescent lightbulbs: an acceptability study

have the potential to reduce electricity consumption for lighting by up to 80 % over existing GLS bulbs, without a significant reduction in lighting quality (and often with-out alteration to lighting infrastructure). Despite this there are significant technical differences between CFL’s & GLS bulbs, and these should be carefully considered Bulb life is 3-15 times longer than GLS bulbs (under test conditions), however warm-up times are in all cases worse. GLS bulbs reach full brightness almost instantly, whereas cold CFL’s may take up to 30 seconds to reach 50 % brightness, and over 5 minutes to reach their full power. Ambient Temperature also affects the perform-ance of CFL’s, and those operating at a typical indoor temperature of 20˚C may only actually be performing at around 80 % of there stated efficiency