The other day in Thaiwatsadu I spotted this Emergency Light. Has some pretty good specifications and throws out decent light. It has three modes.
One small draw back the ac charge plug is its length only 50cm.
I am fortunate that the majority of my 220 V outlets are only 200mm above floor level so the lead is adequate. In the kitchen there are 6 outlets 400mm above the worktops so that's OK also.