I am a retired `techie’ (B Sc, Eng) and we have used CFL lights over the years .also I dabble with a soldering iron and have built valve and transistor amplifiers, zero crossing Triac controllers, etc over the years.
We are having our kitchen extended, and looking at lighting options.
1) I’m not sure that the GU10 lamp style was ever really intended to accommodate the rectifier and capacitor components to convert 240 volt ac (rms) to LED type DC voltages. This is even more relevant if the components are `potted’, which impedes heat dissipation …..
2) The other option is `integrated’ LED lamps, perhaps with an electronic driver circuit external to the LED assembly; however, these seem costly, and I would not want to be stuck with non standard holes in the plasterboard in the years to come, if/when a particular brand/type becomes obsolete ?
3) How long do you test your bulbs for? ie MTBF data ?
Any further comment on where to go for a new installation would be appreciated !
1) Think you may be pleasantly surprised in the developments of miniature switched mode power supply units used in the “proper” LED units from recognized manufacturers. With and efficiency of 80 -85% and total input current in the order of 50mA, we’ll let you do the maths. We deal with tens of thousands of lamps per year and the relative failure of lamps, and yes there are bound to be failures for any number of reasons discounting misuse and abuse, such as infant mortality heavily biased to LED failure and not power supply issues.
2) You have not considered the third way. Use the 12v low voltage of the lamps, generally referred to as MR16. Very little electronics if you are concerned about heat. One switched mode power supply supplies 11.5 volts via suitably rated cable to the lamps, or if you prefer a traditional iron copper transformer suitably rated.
3) We have a number of ongoing real world tests in progress stretching back several years. A typical test we can give you firm figures for, not manufacturers extrapolated figures is just over 148,000hrs MTBF with a 2:1 on off ratio of operation.