Good idea. And yeah, I have a couple of candles that are similar to these:
http://www.lamplust.com/evolution-rechargeable-candles-p-254.html?cPath=3 I use them often at home instead of real candles. They're safer, but look reeeeally nice and almost like real candles, when you have all other lighting turned down or completely off. So I just might take one of them with me, just in case...no idea.
And about lighters....Well, if we have to go through security with all our bags and jackets going through the x-ray thingy like they have at the airports...it could be possible for them to see lighters and then take them away. Just don't know if smoking is allowed anywhere inside the O2. If it is, then I guess they won't be taking lighters away? I don't smoke, so I don't know.