12 UV LED Flashlight specs?

Using a 12 UV LED flashlight head for another use.  Flashlight runs on 3 - AAA batteries and I want to use in an application where it is driven by a 9V battery.  I don't know how to get mA info for a flashlight head to calc a resistor.  Anybody have info that would help?

lemonie7 years ago
4.5V is about right for UV, where's this 12V coming from?
I reckon be safe with 10mA and use a 470 Ohm resistor for a 9V supply.

I think he means 12 LEDs that emit UV, not 12V. It's just worded a little confusingly.
Oh yeah, I read that wrong.