Oh nm, ignore me I'm retarded. Here is a quote from wikipedia
"OLEDs typically emit less light per area than inorganic solid-state based LEDs which are usually designed for use as point-light sources." Wikipedia

Then again we are not exactly using LEDs as the point-light sources in this case are we? We are hanging arrays a foot above them. If we were using them as point-light sources then we'ld be putting them directly on the fan leafs.