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Tiff and I bought light-up Blade-Runner style umbrellas from eBay for EMFCamp 2014.
But they were a bit dim and crappy:
On this model, the feeble LED handle can be removed by pulling out a brass pin with pliers and twisting to break the acrylic light guide away from its glue:
Or, you could just saw through the acrylic just above the handle. Either way, after that, file the end smooth then polish it with a very gentle application of fire.
Do not set light to the umbrella! Always remember Rule Zero!
Then, get a suitable cheap but bright LED torch, ideally a 2AA one so it is long enough to be a handle.
And find, cobble, or make an simple adapter to join the torch to the end of the acrylic:
Much better:
For extra value, you can polish the other end of the acrylic, which gets you a beam out of the end that you can use to point at things while having opinions.