Actually, thinking back on this, I need to do a different calculation. The candle is directly converting hydrocarbons into heat and light. If you burned those h

Actually, thinking back on this, I need to do a different calculation. The candle is directly converting hydrocarbons into heat and light. If you burned those hydrocarbons in a power plant, how many watt-hours would be produced? (For that matter, how long will that candle burn for?) Ignore delivery/transmission costs: I'm curious what kind of losses there are in burning (say) oil for electricity vs. just setting it on fire, in the context of lighting.