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These are good and use 25% power for equivalent filament lamp BUT They don't like being switched on/off frequently and will quickly fail. Be wary of using them on automatic night light switches. These use a light sensor to detect the onset of darkness and switch the lamp on. Unfortunately some of them can tend to flutter around the switch over point and this is very bad for a CFL. Indeed there have been cases where a householder left one of these on while she went on holiday and came home to find her house burnt down. Fire caused by an overheated CFL using one of the threshold switches. Older CFls cannot be used with dimmer switches. A proper dimmable lamp must be used x2 cost) I now have gone over to LED lamps for outside security lighting 6W vs 15W and I leave them on permanently (porch side and back), no threshold switch to go wrong. Should last 20 years!!!!!!!!!!!!!!!!! Cost per year £10 pa Last year had 2 CFLs failed (£10) plus annoyance of getting ladders out.