Streamlight 66318 MicroStream C4 LED Pen Light

Amazon.co.uk Price: £14.59 (as of 24/05/2019 11:01 PST- Details)

C4 LED technology, impervious to shock with a 30,000 hour lifetime
Output/Run time:
45 lumens,420 candela,41m beam,runs 2.25 hours