The 'Max 60W' rating of your luminaire is because of the heat output of the standard general service lamp it was designed for. Your energy saver lamp is a compact fluorescent and is much more efficient, producing a higher ratio of light to heat. The 100W figure is simply for comparison, saying that this will produce an equivalent light output to a standard 100W lamp whilst actually only needing 20W of power input.
So the answer to your question is yes, you can use it.
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