Although lumens is different than wattage you can get a pretty good ballpark comparing same technologies (i.e your old chandelier had 240 watts, new one is 500 watts (twice as bright).

In comparing the 2 new chandeliers (the 500 watt vs 52 watt fluorescent), the 500 watt will have more lumens as well. But I would be more concerned with the color rating when comparing the incand (500 W) fixture with the Fluor fixture. Obviously the fluor will be energy efficient but I'm not sure you'll like the quality of the light for a chandelier (too blue/cold). They do make lower temp fluro's (i.e. warmer color), but I don't think a foyer chandelier (or any chandelier) is the best application for fluorescent. Note; Also is cannot be used on a dimmer switch.

LED's have a similar prob with blue color temp. With a chandelier, i rtecommend sticking with incand.

Here is a link that might be useful: info about LED's not really ready for higher power applications

Thank you so much!

You also addressed my unspoken concern about fluro being a good application for this type of lighting.

I've never been a big fan of fluorescent lighting and most of the time when I try to swap out for the energy efficiency, I end up switching back to warm decorator bulbs or GE Reveal bulbs. My friends and family think I'm nuts, because they say they see no difference between fluoro lighting and other types of household lighting.

Thanks again!