Good high-lumen LED suppliers?
LedEngin manufactures a number of high-wattage LEDs and modules, including UV LEDs,  targetting UV adhesive curing applications.  Their primary distributor is Mouser.  

Their thermal pads are not electrically neutral, and must be isolated from the rest of the PCB. They do this for you if you buy one of their presoldered modules.

Their datasheets contain relative intensity to current curves, rather than lumen to current curves, because lumens are a unit defined by the power of light perceived by the human eye, and UV light is imperceptible.  Especially if you're trying to cure an adhesive, you're interested not in lumens, but rather in watts (of light) per square meter.  This is only a small percentage of the electrical watts dissipated by the device, about 20% for 395nm UV LEDs, and as low as 5% for 365nm LEDs.  For most LEDs, this "curve" is a fairly straight line, corresponding to, say, 20% of the total power dissipated for UV LEDs. 

Especially when working with high power LEDs, you'll also want to look at the temperature to radiant intensity curve. As the LED warms up, the intensity drops.  A combination of the current and temperature curves into one would be a nice datasheet feature, but I haven't seen one.

Safety notice:
I'm sure you know this, but looking at high-brightness UV or IR LEDs can harm your eyes, and UV LEDs will give you sunburn.  Most UV LEDs will be in the UV-A spectrum from 320-400nm, and, while this spectrum is not as dangerous/cancerous as UV-B, it will still give you a tan or worse.  You'll want sunglasses on your eyes (They don't have to be dark, just rated for UV), and sunscreen on your hands when experimenting with these.  Setting up a webcam to continuously monitor your workbench so that you know for sure when the LED is on would also be a good idea.