I just mounted a 250w heat lamp beneath my monitor and aimed at my keyboard and torso. It's plenty to keep my warm in the office, so I've got the thermostat set to 50 degrees between 8am-5pm when it's just me at home. If I run it 40hrs per week, I'll spend $4 month in electricity.
I might try a 150w bulb next since 225 (measured) is more than adequate.
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