any ideas where I can get a led like this : http://www.rapidled.com/violet-uv-led/
similar leds can be find in the flashlights :
http://dx.com/p/uniquefire-602c-uv-3w-395-410nm-ultraviolet-led-uv-flashlight-black-1-x-cr123a-16340-205666#.UxV5OmaTtR0
http://www.fasttech.com/products/0/10004661/1358900-uniquefire-602c-uv-3w-395-410nm-ultraviolet-uv
You can find it in those lights ;-) ( they are cheap enough to buy them just for the scavenge)
But, to answer your question, I tried to search the internet a few months ago for those and similar chinese uv-leds, and I did find pictures on vague websites, but no direct seller.
Prolight opto,part number PK2N-1LLE, 3.5x3.5mm,xp footprint,much brighter/more efficient than those chinese versions for sure.
nice thanks, I found this website http://www.maritex.com.pl/en/shop/products/29234/ ,they have listed as well the PK2N-3LLE-L any ideas what to choose ? ,forget they charge 10euro for shipping , have you seen them in any online shop i just need 3-4 pieces.
Made in Taiwan. Do you have one of these? More details would be helpful.
http://www.prolightopto.com/productsinfo-1011-1192-961-en.html#pro1
No,I don't but they look OK,you can find flux numbers,bins etc. in datasheet,which is very uncommon for generic UV,IR leds.
Most generic UV 400nm-ish leds are in 40-100mW range,this LED is several times more efficient.
I see you are from USA,you could order some of these:
Same manufacturer same die,but different(1W generic) package,and you can choose output and nm bins. 475mW@350mA is one of the highest numbers I've seen for 400nm leds(If I remember,only ledengin makes better UV's but price is much higher).
much much higher price ,to get a good uv led prices start from 30 usd up to 200 and more.
Luxeon UV. 1 ampere maximum drive current. i just have to find a suitable MCPCB
cheapest I’ve found is 13euro ,without shipping at http://eu.mouser.com/Philips-Lumileds/High-Power-LEDs-Single-Color/LUXEON-UV-Series/\_/N-1yyvhk6Z8usfnZ1yxjbj1?
possible pcb for this : Star PCB for Luxeon Rebel - Made for 1 Luxeon REBEL
I have never had any luck finding 365nm UV light or something close as that 380nm at a good price or good shipping. MFM’s UV shoot out thread always makes me want a TK UV. But I’m too cheap.
410-420nm (op link) is not really a uv, more like violet.
ledengin makes 365nm uv leds, but they are not cheap, like $35 a piece. for samllest one.
Anyone want to host a group buy? $4.50 each from the OP's link, then $7 for USPS shipping on the order... Then packaging... Then shipping to individual buyers. It would end up being $10+/each, might as well buy the built lights and consider it getting a free host in the deal. 
On a related note: a four-die version of the same LED!
-the seller i posted above for a sample package of 10 he can do it 2-3 usd each .
-and charge extra $50 for shipping.
Is that the 1w or 3w version? Shipping cost?
-This product is no longer available. ,about shipping i guess will be free,when he reply i will ask him if its 1w or 3w-asked 50$ extra for shipping.
if he can ship to individual addresses i would be up for 3 =)
I think he can , the version above is 1w version
edit
alert ,even i asked for a price INCLUDING shipping ,now the seller replyed me and asked $50 for shipping with DHL ,ofcourse declined and waiting for his answer….
Is that the shipping cost for a few leds… or a small pony?
asked for a refund forget the above seller,back to the searching……