on21,
On the second photo (G-JIVE), it looks very much like a NightScanner, a movable spot-light for night operations. It's controlled with a little coolie-hat on the collective.
I'm guessing it's probably the same on the JetRanger (although the housing does look slightly different to our B206s).
And, yes, it is an 'optional extra'!
HTH,
B73