Ive fished there a handfull of times. Generally pretty shallow along the shorelines, lots of falldowns, lots of carp, mostly small, lots of 8 to 12lb carp.. bass in there, some big, but I never caught any big. Lots of crappies, can catch them this time of year, and in the summer. yellow and white perch, I heard theres hybrids in there too. Delaware license is something like 10 bucks? why not.
IMO there are other ponds in Northern Delaware that are better than Lums. If you want to spend a day catching sunnies, crappy etc, then yea its nice, but I wouldnt buy a DE liscense just to fish there. I live in DE and havent fished there in years.