[bwy]

I'm probably just ignorant, but I don't know too much about power (Is my light bulb usually around 80 W-h? 200W? 100kWh? I have no idea.) I think you're right, but I do also think the main point was the relative expenditure, a 30% increase.

[sp332]

Incandescent bulbs are usually 60W but can be 40W for a reading lamp or 100W to light up a whole room. Those haven't been sold in most countries for a while now due to their extreme inefficiency, but other bulb types are often compared to a similar incandescent bulb. For example a 14W fluorescent bulb might say "60W equivalent".

Watt-hours really are as simple as they sound. A 14W bulb that's on for an hour used 14 Watt-hours.