I wrote a question to Randall Munroe, author of XKCD comics

Reading and loving What If? 

Question:  Given that vampires can be killed only by Catholic sacramentals and sacraments (nobody ever kills vampires with Baptist hymnals or Nebraska Missionary Alliance communion crackers) *and* by sunlight, I need to know:  Can a full spectrum flashlight with sun-equivalent candle power kill a vampire if it has been properly blessed by a Catholic priest using holy water and all the rites, gestures, words, and customs appertaining thereto?

I am a Catholic writer and a geek, so I have a professional interest in your answer.  Millions of souls may be hanging in the balance.

I will let you know if he replies. Meantime, check out his wonderful book, which I got for my birfday. Load o’fun!: