its only a small attic about 6m x 5m
ill look for the 21led one
and at some of your other recomendations
thanks
Alex
just remembered, i did a timing test on the 21led model (just checked my headlamps.xls XL spreadsheet). the range was 5.5h to 6h on a pair of 2xAA alkaline cells. sorry, never did a burntime test on NiMH cells. i must have been thinking of another headlamp when i greatly overestimated the burntime in my prev. Post.
when the cells are just 'bout expended the headlamp drops to "glow" mode, as i term it. in just a minute, your eyes will adjust to the GREATLY reduced light output and you ought to be able to make it out of the attic, or activate a backup light source (e.g., a small MagLite Solitaire which has a fresh cell in it since it's only used for the type of situation).
here's just one URL to that eBay headlamp.
http://cgi.ebay.com/21-LED-HeadLamp...ryZ83552QQssPageNameZWDVWQQrdZ1QQcmdZViewItem
there are other 21 LED headlamps (and 23, 25, 27, 37, 40, .... LED headlamps). most of them run on 3xAAA cells, though a larger 40 LED headlamp runs on 3xAA cells. these others have multiple modes (usually 3 different number of LEDs on, depending upon mode, plus a flashing mode). these are also decent quality (with just a few exceptions - the Tikka "knockoffs" are notoriously BAD IME [in my experience] and i can't recommend them). i actually prefer the 2xAA 21 LED version i recommended over the 21+ LED 3xAAA versions. the physically larger 40LED 3xAA headlamp is fine too, but a bit too bulky - it extends a ways out front and is subject to bouncing if the top/bucket strap is tensioned too loose.
oh,...also, the 2xAA 21 LED headlamp does NOT use a battery carrier for the cells. ALL of the others, IME (including the larger 3xAA 40LED headlamp), use a battery carrier to hold the cells, meaning you load the cells into the battery carrier and then insert the carrier into the headlamp and replace the cover.
with the 2xAA 21 LED headlamp, you just insert the two cells (observing the clearly marked polarity indications inside of the battery compartment) and snap the cover closed.
hope this info helps.