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UV works the best...but can be intense with certain types of glow plastics.
Other options are one of those super bright rechargeable million candle light lights..they are a little bulky and will blind everybody in the group if not used properly...so will the UV light.
A rechargeable camera flash works good too.
Generally anything capable of super bright light.
I personally use UV LED.
I have also seen people use a black that is attached over their bag.
This way, the disc is ready charged when they need it.
I like this:
Or, for more power, this:
They make some that also have a flash light. I used to use one to check IDs when I worked as a door guy.
Just be sure to pay your monthly balance or the interest will kill you.