They don't usually even have a transformer. Fluorescent types have a ballast, iron cored or high frequency. Halogen or LEDs usually have a switch mode power supply, a transformer would be very rare these days.
If you need to find a tradesperson to get your job done, please try our local search below,
or if you are doing it yourself you can find suppliers local to you.
Select the supplier or trade you require, enter your location to begin your search.
Please select a service and enter a location to continue...
Are you a trade or supplier? You can create your listing free at DIYnot Local