Roy I never thought you could endorse any other lamp!
Are you going to try one yourself?
Certainly if I had not put so much cash into the new Oldhams I would be thinking of them myself, especially since Simon R must be impressed as well.
I switched from the lead acid Oldhams around 12 years ago, and at that time went down the Speleotechnix route.
Using helmet carrying lithium ion batteries.
I must say it always seemed to me that the helmet carried too much weight, and when a serious accident a couple of years later wiped out this technology for me I returned to the Oldham fold, once more.
To those contributors who think that this thread has gone on a bit.
I will make just one point, underground only two things matter, your lamp and your mate! The latter should not be discussed in a forum like this but we will debate the former for some considerable time.