For a cost effective light source with good performance the Coleman 8D LED lantern is keenly priced @ around $30.
http://www.coleman.com/coleman/colemancom/detail.asp?product_id=4345-701&categoryid=1045Cree XLamp® XR-E LED 175 lumens on high (enough to light a medium sized room in an emergency)
Run time: 66 hours on low, 32 hours on high (good run times) i.e. about 5-10 days at 6 hours per day
4 packs of twin LR20s D cells typically costs around $7-8.
http://www.thomasdistributing.com/GE-Sanyo-D-Alkaline-Battery_p_1767.html So for around $40 outlay good performance portable LED lighting for 5-10 days use is available.
Rechargeable LSD NiMh LR20 D cells are now available with capacities of 10,000mAhrs (around 12 Whrs), just slightly less capacities than fresh Alkaline D cells, though they are much more expensive initially to purchase.
http://www.thomasdistributing.com/Accupo...ies_p_1034.htmlThese would be excellent for a much longer term power outage especially if used with a 12V capable battery charger such as the Ansmann Powerline 5 LCD Intelligent Battery Charger for a Solar Power setup with a 30W Solar Panel kit setup.
http://www.tantronics.co.uk/acatalog/Info_chg-ans-pl5-lcd.htmlhttp://www.thousandsuns.com/30_watt_solar_panel/p432875_1536885.aspx
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