i have a request from a customer to remove all his 12 volt downlighters and install 230 volt downlighters...because he wants to save electricity.

unless i am missing something a 50 watt lamp whether it is 12 volt with a transfomer or 230 volt draws the same amount of power...i dont see how you can save money...what he will find is the 230 volt lamps pop a lot faste rthan the 12volt ones do...so in the long run he will be paying more replacing lamps than he will just sticking to the 12 volts ones...provided the installation was done correctly...using the correct size wires.

w=vxi

whether you use a 50 va transfomer or a 50 watt lamp it draws about the same amount of power.

now if he was considering replacing with led lights then i could understand...the led lights are becoming more efficient and if you buy good quality ones will also give you a much better lux reading when do your lux report once all the lamps have been replaced...because a 3 or 7 watt led lamp draws a lot less than a 50 watt.