In reply to:

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(in fact, I have it there now - didn't realise until I arrived at work!)

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LOL....sounds like they're becoming eminently losable, something that can't be said for the bulky Zoom.

I assume that your brightness comparisons are against the standard Zoom bulb which is spec'd at 30m. The halogen is spec'd at 100m, which was very useful when I was a Scout Leader in the UK....Running a mixed (US: co-ed) troop requires some vigilence!