Having worked in sumps with both HID and LED in poor vis the punch power of a HID is far better than a LED. I have recently replaced my umbilical HID with another. Of course the down side is the (possible) fragility of the light unit (not cheap) although in five years I have only damaged one. Also at present the weak dollar gave me the ability of buying a Dive Rite HID (Dive Rite express) It took three days to arrive and still a good price ,even with import duty.
I run my HID helmet mounted with three back up LED,s (Tektite EXPEDITION STAR,s)
This is Colin`s with a FAMi (LED) do not have a HID picture to hand
Andrew.