For long term lighting during wintertime I will be using a Bullfinch 1616 Handilight Lantern. It will give me approx 250 hrs continuous use at an equivalent 100W incandescent light output (150W @96gms/hr) i.e. around 1250-1500 Lumen when using a standard 15Kg LPG bottle. So if in use for 6 hrs per day would give me around 6 weeks use operationally on a single LPG bottle.
http://www.gasproducts.co.uk/acatalog/Bullfinch_1616_Handilight_Gas_Lantern.htmlIt also has the other benefit of providing some supplementary heat output as well during long 16 hr winter nights. During summertime it doesn't really get dark (sunset around 11pm and rises around 5am) and a solar PV battery system/LED lighting will easily cope with any outages.
I agree that the Bullfinch gas handilights suggested in the above post are excellent.
I have two of them and would recommend them, especially to UK members of these forums.
Unfortunately production has now ceased, but only recently and some distributors should still have stocks. I would therefore urge that anyone wanting one of these lights should purchase now. Used or NOS handilights turn up regularly on UK fleabay.
(and yes I know that this is a very old thread, but discussions about long term emergency lighting in general, and these gas lights in particular are still relevant)