Indeed I did see them, the lumenarcs get good coverage, but they're quite a large piece of sheet metal. I have "spider reflectors" (the hellolights kind) on both of my tanks and am quite happy with them. If my budget had room for fancy reflectors, I might go with the lumenarcs, but at that price I'd rather spend the money on living items for my tank. I can live with 90% reflectivity as opposed to 98%.