How much does it cost to run a four foot fluorescent bulb?

The cost to run a four-foot fluorescent bulb varies based on electricity rates and usage. On average, a standard four-foot fluorescent bulb uses about 32 watts. If you operate it for 12 hours a day at an electricity rate of $0.13 per kilowatt-hour, it would cost approximately $0.50 per month. However, costs can fluctuate depending on local electricity rates and specific usage patterns.