I don't know about the Lee filters, but...
I can attest that the colors you get with the color discs are pretty terrible. Especially with SF's Frost White LED, which isn't a pure white -- it's 3 white dies and 1 blue die. So reds end up more pink, greens end up mint green or light blue, and yellow just looks bad. Blue discs look the best, but you might as well just use a blue LED. And to actually get a strong hue you need to use multiple discs, which really dims the blade. Besides blue the only color I could make that looked halfway decent was orange, but it was very dim.