oooh i want those
heres what i know, and im not an LED expert, but i do buy them here and
i have installed several in buildings, lamps and locos
the LED typically, when it has the plastic tube and rounded end (as opposed to the tiny chip-like emitter-) -either short or the longer ones we're all familiar with, are fairly unidirectional-sometimes very much so-depends upon the clarity of the plastic used-
i find the newest versions, from the source i use, evans , have crystal clear plastic and they are intense, very bright and pure in color -simply amazing for signals
this focus is great for the look of a bulb shining down , for a conical spill, and is good for creating the look of a porch light, dock light etc
here are two proven methods i have used to add disbursal,
one is to sand , with say200-400 grit, the LED plastic-this disapates the light a good deal
not relevant to the bulbs, perhaps, but also 5mm, 3mm, and tiny 1.2 mm all have perfect uses-larger is..larger...smaller...is pinpoint and becasue so bright, can really have an amazing effect as well-like on a loco control panel, or, on a desk lamp, rtc
another method to disapate, is to simply clip the end , ie, the domed or rounded portion, making it flat
in installations that did not allow for the full length LED-like a tight loco lamp housing, I use specail rail end clippers, which sheer instead of crushing-i have yet to lose or destroy an LED using this method-it too will create a wider disapation of the light (as oppsed to the rounded end-which acts much like a magnifying glass-in reverse
i have used LEDs in tiny brass tubing under building eaves to create a spotlight on a station clock-ie like a theatrical can light-and adjusting where the LED sits in the tube can foucs the light nicely
as for coating them, i havent tried this but i would think a flat clear would do well
hope this helps
say for use in a staniz lamp-i would thoroughly and evenly sand-as the beam will focus up- it will not look the same as an omnidirectional incandescent lamp-the hot point will not be visible from striaght on-ony from looking down into the headlight-a tiny bit of foil reflector at the top rim might work well-but i havent tried this-the best is to have the LED face the direction you want it to light-usually-unless you want indirect 'bounce'
for wall lamps they ought to do pretty well -in fact perhaps fantastic depending upon what it is you want-i think spot lighting is dramatic, but if you really want the yards lighted, maybe not as much
if i had a paypal account, id snatch those up right now
you didnt ask but ill add color temp can be very important
i have used cool white a few times, because it is so intense and bright, like the new car headlamps, but they evoke an entirely different era of technology-and it is this point i wish to emphasize-warm colors are older tech, hot blueish tints-ie white blue, purple, UV etc always evoke in me much much newer tech-these are the colors or acetylene torches, flourescent lights, HID lamps etc-
and...changing the tint with clear paint.....kinda works....but the eye is sensitive to color temp...adding clear yellow over a cool white can actually make it too yellow (not warm with some tiny amount or red) or even green
i have to get those screws ins-wonder if theyre available over here???
). I have sand-papered (120+ grade) the bulb surface to give a wider spread for out side lower buildings etc. 
