I know you can get 8w fluorescent luminaires which work on AC/DC 110v. If you look for SLAVE emergency luminaires you should find some. Not seen an LED version yet, the LED one's I have seen tend to be self contained.
1: is the system always AC? always DC? DC when on battery but AC when on mains?
2: is replacing the fitting acceptable or does this need to be a plug in solouton?
3: why LED?
I'm not a great fan of LED lighting, you'd think they'd last for years but in reality they don't, they fade down over time.
I'd stick with 8w tubes, easy to replace.
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