shape...no question thats what works best for me. as it gets later in the year you can observe color differences better as grass and weeds start to push through the leaf litter, but by then you don't have many good days left. otherwise the morels, whether yellows or blacks, match color perfect. even the sheen at which they reflect sunlight is perfect. it'll be nice now that i have a couple XP-G's...i think those might be about the best emitter for this type of thing.
not sure i understand why there's a preference for incan. i get that the glare off your surroundings is much more natural and pleasing to the eye, but do you really think that it highlights morels relative to the background better than LEDs??? i just don't see it when i've tried it.
and just where on earth would i find this laser that can cover the visible spectrum (& beyond if possible)??? does it have a lens, diffuser or some other means by which to scatter light over an area?