Using watts as a measure of light output is difficult given that there are differing efficiencies in light production.

A bare 60W incandescent produces between 800 - 900+ lumens, while a 100W will provide ~ 1500 - 1700 lumens.

Almost all bulbs will have some decorative and/or protective shade/ enclosure which will detract from the actual output.

A better way is to figure out the amount of light required by calculating as described in the following link.

Here is a link that might be useful: recessed lighting discussion

Thank you!