Scroll down about half way for the LED section. It looks like you want to look for the specs on your specific light. If the wave length is not 365 nm, I wouldn't buy it. I have never used LEDs for black light but would be interested if anybody has some good recommendations on some.
My experience with blacklight leds has been hit or miss - I have one flashlight that works well, but other leds I've tried don't seem to output the right wavelength. It doesn't help that companies call any purple light at all a blacklight. If you're talking about the spirit spotlight, from what I've seen at the stores the output seems flaky. A flourescent tube is a better bet, and cheaper as well.
Problem I have found with LEDs is that the frequency will change after use and go beyond expected tolerances. For UV go florescent. I use the “American DJ UVPANELHP” and recommend these. You can use them on the ground or they can be flown. For a spot, I have “been told” their “ADJUVCANON” works just as good. However something like this you would most likely want to fly mount.