## How much does a 40 watt bulb cost per day?

What Uses Watts in Your Home

Appliance/Equipment | Avg. Usage | Cost/Month |
---|---|---|

40-Watt Bulb (40 W) Equivalent compact fluorescent | 4 hours/day 4 hours/day | $.50 $.14 |

60-Watt Bulb (60 W) Equivalent compact fluorescent | 4 hours/day 4 hours/day | $.70 $.16 |

75-Watt Bulb (75 W) Equivalent compact fluorescent | 4 hours/day 4 hours/day | $.90 $.25 |

### How much does it cost to power a light bulb for a day?

A “normal” incandescent bulb costs about 0.75cents per hour, and LEDs or CFLs cost only one-sixth of that – so leaving the lights on (either overnight or while you’re at work for the day, say both are about 8 hours) costs you roughly 6 cents for a normal light and a bit over 1 cent for modern bulbs.

#### How much does it cost to run a 100 watt light bulb?

In reality, electricity costs somewhere between $0.05 and $0.50 per kWh. So, in this unrealistic problem, the light bulb would cost $0.84 dollars per hour * 4.5 hours to run for 4.5 hours. In reality, it would cost between $0.0225 and $0.225 to run a 100-watt light bulb for 4.5 hours.

**How many hours does a LED light bulb last?**

A typical cheap (60 watt equivalent to incandescent) LED light bulb is advertised as providing 800 lumens, lasting up to 10,000 hours at 10 watts. Click calculate to find out the electricity cost of a single LED light bulb running at 10 Watts for 5 hours a day @ $0.10 per kWh, you can also modify the input fields if needed. Cost Per Hour:

**How many Watts Does a LED light bulb use?**

A typical cheap (60 watt equivalent to incandescent) LED light bulb is advertised as providing 800 lumens, lasting up to 10,000 hours at 10 watts. Click calculate to find out the electricity cost of a single LED light bulb running at 10 Wattsfor 5 hours a day @ $0.10 per kWh, you can also modify the input fields if needed.

## How to calculate the monthly cost of light bulbs?

To determine the monthly cost, multiply the energy used per day by 30 to get the monthly kilowatt hours used. For example, let’s find the kilowatt hours (kWh) used for a fixture with three 60 W light bulbs that is on for 8 hours per day.