I just reworked my entire sump to no longer require filter socks. They're great in theory, but the good 200 micron felt socks that I have need to be replaced about every 18 hours or they clog up completely and overflow. It gets old quick. And fwiw, it think you're going to get detritus build up in a sump with lighting no matter what you do. The detritus, 9 times out of 10 is the byproduct of bacterial activity, which is taking place everywhere, especially in areas with light and corals. For the time that they're not overflowing, they definitely do make a difference in the amount of crap floating around however.
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