Luke Skywalker vs. Darth Vader: FIGHT!
I'm not impressed. If you're going to go as far as getting a lightsaber tattoo of any kind, go all the way and use glow in the dark ink. THAT would be impressive.
Glow in the dark ink is extremely poisonous and inserting it into your skin would likely kill you, if not cause some horrible skin reaction.
However, Blacklight reactive ink would do the trick, and that CAN be used safely. Thiss, these are pretty cool!
It's all fun and games until someone loses a hand.