# Electricity Calculations for Different Grow Lights

Updated May 24, 2019

## CFL Electricity Calculations

### Estimated Total Electricity Cost for CFLs and Fans (\$0.12/kWh) = \$27/month

This includes the cost of running the grow lights and fans.

Electricity Cost for CFLs: \$16/month

Total hours: 558 light hours/month (CFLs are on 18 hours/day for 31 days)

CFL Wattage: Total of 244W for all CFLs

At \$0.12/kWh (everyone is charged different rates, but this is about average for cities), the monthly cost of electricity for the light is \$16.

HOURS x COST/HOUR =

558 x (0.12 x 0.244) = \$16

Electricity Cost for Exhaust Fan: \$6/month

Total hours: 744 fan hours (fan is on 24 hours/day for 31 days)

Exhaust Fan Wattage: 68W

At \$0.12/kWh (everyone is charged different rates, but this is about average for cities), the monthly cost of electricity for the light is \$6

HOURS x COST/HOUR =

744 x (0.12 x 0.068) = \$6

Electricity Cost for 2 Clip-On Fans: \$5/month

Total hours: 744 fan hours (fan is on 24 hours/day for 31 days)

Exhaust Fan Wattage: 30W each x 2 = Total of 60W

At \$0.12/kWh (everyone is charged different rates, but this is about average for cities), the monthly cost of electricity for the light is \$5.

HOURS x COST/HOUR =

744 x (0.12 x 0.060) = \$5

### Estimated Total Electricity Cost for CFLs and Fans = \$59/month at \$0.25/kWh

This includes the cost of running the grow lights and fans.

Electricity Cost for CFLs: \$35/month

Total hours: 558 light hours/month (CFLs are on 18 hours/day for 31 days)

CFL Wattage: Total of 244W for all CFLs

At \$0.25/kWh (everyone is charged different rates, but this is about average for cities), the monthly cost of electricity for the light is \$35.

HOURS x COST/HOUR =

558 x (0.25 x 0.244) = \$35

Electricity Cost for Exhaust Fan: \$13/month

Total hours: 744 fan hours (fan is on 24 hours/day for 31 days)

Exhaust Fan Wattage: 68W

At \$0.25/kWh (everyone is charged different rates, but this is about average for cities), the monthly cost of electricity for the light is \$13.

HOURS x COST/HOUR =

744 x (0.25 x 0.068) = \$13

Electricity Cost for 2 Clip-On Fans: \$11/month

Total hours: 744 fan hours (fan is on 24 hours/day for 31 days)

Exhaust Fan Wattage: 30W each x 2 = Total of 60W

At \$0.25/kWh (everyone is charged different rates, but this is about average for cities), the monthly cost of electricity for the light is \$13.

HOURS x COST/HOUR =

744 x (0.25 x 0.060) = \$11

## Mini Tent with HLG 100 Electricity Calculations

### Estimated Total Electricity Cost for HLG 100 and Fan (\$0.12/kWh) = \$10/month

This includes the cost of running the grow lights and fans.

Electricity Cost for HLG 100: \$7/month

Total hours: 558 light hours/month (lights are on 18 hours/day for 31 days)

HLG 100 Wattage: Total of 100W

At \$0.12/kWh (everyone is charged different rates, but this is the USA average)…

HOURS x COST/HOUR = Monthly Cost

558 x (0.12 x 0.100) = \$7

Electricity Cost for Exhaust Fan: \$3/month

Total hours: 744 fan hours (fan is on 24 hours/day for 31 days)

Exhaust Fan Wattage: 29W

At \$0.12/kWh (everyone is charged different rates, but this is the U.S. average).

HOURS x COST/HOUR = Monthly cost

744 x (0.12 x 0.029) = \$3

### Estimated Total Electricity Cost for HLG 100 and Fan = \$20/month at \$0.25/kWh

This includes the cost of running the grow lights and fans.

Electricity Cost for HLG 100: \$14/month

Total hours: 558 light hours/month (lights are on 18 hours/day for 31 days)

HLG 100 Wattage: Total of 100W

At \$0.25/kWh (everyone is charged different rates, but this is about average for cities)…

HOURS x COST/HOUR = Monthly Cost

558 x (0.25 x 0.100) = \$14

Electricity Cost for Exhaust Fan: \$6/month

Total hours: 744 fan hours (fan is on 24 hours/day for 31 days)

Exhaust Fan Wattage: 29W

At \$0.12/kWh (everyone is charged different rates, but this is about average for cities).

HOURS x COST/HOUR = Monthly cost

744 x (0.25 x 0.029) = \$6

## Starter LED Electricity Calculations

### Estimated Total Electricity Cost for LEDs and Fans (\$0.12/kWh) = \$23/month

This includes the cost of running the grow lights and fans.

Electricity Cost for LED Grow Lights: \$12/month

Total hours: 558 light hours/month (LEDs are on 18 lhours/day for 31 days)

LED Grow Light Wattage: Total of 185W

At \$0.12/kWh (everyone is charged different rates, but this is about average for cities), the monthly cost of electricity for the light is \$12.

HOURS x COST/HOUR =

558 x (0.12 x 0.185) = \$12

Electricity Cost for Exhaust Fan: \$6/month

Total hours: 744 fan hours (fan is on 24 hours/day for 31 days)

Exhaust Fan Wattage: 68W

At \$0.12/kWh (everyone is charged different rates, but this is about average for cities), the monthly cost of electricity for the light is \$6.

HOURS x COST/HOUR =

744 x (0.12 x 0.068) = \$6

Electricity Cost for 2 Clip-On Fans: \$5/month

Total hours: 744 fan hours (fan is on 24 hours/day for 31 days)

Exhaust Fan Wattage: 30W each x 2 = Total of 60W

At \$0.12/kWh (everyone is charged different rates, but this is about average for cities), the monthly cost of electricity for the light is \$5.

HOURS x COST/HOUR =

744 x (0.12 x 0.060) = \$5

### Estimated Total Electricity Cost for LEDs and Fans (\$0.25/kWh)= \$49/month

This includes the cost of running the grow lights and fans.

Electricity Cost for LED Grow Lights: \$25/month

Total hours: 558 light hours/month (LEDs are on 18 lhours/day for 31 days)

LED Grow Light Wattage: Total of 185W

At \$0.25/kWh (everyone is charged different rates, but this is about average for cities), the monthly cost of electricity for the light is \$26.

HOURS x COST/HOUR =

558 x (0.25 x 0.185) = \$26

Electricity Cost for Exhaust Fan: \$13/month

Total hours: 744 fan hours (fan is on 24 hours/day for 31 days)

Exhaust Fan Wattage: 68W

At \$0.25/kWh (everyone is charged different rates, but this is about average for cities), the monthly cost of electricity for the light is \$13.

HOURS x COST/HOUR =

744 x (0.25 x 0.068) = \$13

Electricity Cost for 2 Clip-On Fans: \$11/month

Total hours: 744 fan hours (fan is on 24 hours/day for 31 days)

Exhaust Fan Wattage: 30W each x 2 = Total of 60W

At \$0.25/kWh (everyone is charged different rates, but this is about average for cities), the monthly cost of electricity for the light is \$13.

HOURS x COST/HOUR =

744 x (0.25 x 0.060) = \$11

## 250W HPS Electricity Calculations

### Estimated Total Electricity Cost for 250W Grow Light and Fans (\$0.12/kWh) = \$21/month

This includes the cost of running the grow lights and fans.

Electricity Cost for MH/HPS Grow Light: \$17/month

Total hours: 558 light hours/month (grow lights are on 18 hours/day for 31 days)

MH/HPS Grow Light Wattage: Total of 250W

At \$0.12/kWh (everyone is charged different rates, but this is about average for cities), the monthly cost of electricity for the light is \$17.

HOURS x COST/HOUR =

558 x (0.12 x 0.250) = \$17

Electricity Cost for Exhaust Fan: \$4/month

Total hours: 744 fan hours (fan is on 24 hours/day for 31 days)

Exhaust Fan Wattage: 40W

At \$0.12/kWh (everyone is charged different rates, but this is about average for cities), the monthly cost of electricity for the light is \$4.

HOURS x COST/HOUR =

744 x (0.12 x 0.040) = \$4

### Estimated Total Electricity Cost for 250W Grow Light and Fans (\$0.25/kWh) = \$43/month

This includes the cost of running the grow lights and fans.

Electricity Cost for MH/HPS Grow Light: \$35/month

Total hours: 558 light hours/month (grow lights are on 18 hours/day for 31 days)

MH/HPS Grow Light Wattage: Total of 250W

At \$0.25/kWh (everyone is charged different rates, but this is about average for cities), the monthly cost of electricity for the light is \$35.

HOURS x COST/HOUR =

558 x (0.25 x 0.250) = \$35

Electricity Cost for Exhaust Fan: \$8/month

Total hours: 744 fan hours (fan is on 24 hours/day for 31 days)

Exhaust Fan Wattage: 40W

At \$0.25/kWh (everyone is charged different rates, but this is about average for cities), the monthly cost of electricity for the exhaust fan is \$8.

HOURS x COST/HOUR =

744 x (0.25 x 0.040) = \$8

## 285W LED Electricity Calculations

### Estimated Total Electricity Cost for 285W Grow Light and Fan (\$0.12/kWh) = \$23/month

This includes the cost of running the grow lights and fans.

Electricity Cost for LED Grow Light: \$19/month

Total hours: 558 light hours/month (grow lights are on 18 hours/day for 31 days)

LED Grow Light Wattage: Total of 285W

At \$0.12/kWh (everyone is charged different rates, but this is about average for cities), the monthly cost of electricity for the light is \$19.

HOURS x COST/HOUR =

558 x (0.12 x 0.285) = \$19

Electricity Cost for Exhaust Fan: \$4/month

Total hours: 744 fan hours (fan is on 24 hours/day for 31 days)

Exhaust Fan Wattage: 40W

At \$0.12/kWh (everyone is charged different rates, but this is about average for cities), the monthly cost of electricity for the light is \$4.

HOURS x COST/HOUR =

744 x (0.12 x 0.040) = \$4

### Estimated Total Electricity Cost for 285W Grow Light and Fan (\$0.25/kWh) = \$48/month

This includes the cost of running the grow lights and fans.

Electricity Cost for LED Grow Light: \$40/month

Total hours: 558 light hours/month (grow lights are on 18 hours/day for 31 days)

LED Grow Light Wattage: Total of 285W

At \$0.12/kWh (everyone is charged different rates, but this is about average for cities), the monthly cost of electricity for the light is \$40.

HOURS x COST/HOUR =

558 x (0.25 x 0.285) = \$40

Electricity Cost for Exhaust Fan: \$8/month

Total hours: 744 fan hours (fan is on 24 hours/day for 31 days)

Exhaust Fan Wattage: 40W

At \$0.12/kWh (everyone is charged different rates, but this is about average for cities), the monthly cost of electricity for the light is \$8.

HOURS x COST/HOUR =

744 x (0.25 x 0.040) = \$8

## LEC Electricity Calculations

### \$0.12/kWh Electricity Cost – Estimated Total for 315W LEC Grow Light and Fans = \$29/month

This includes the cost of running the grow lights and fans if your electricity costs \$0.12/kWh (average cost of electricity in the US).

Electricity Cost for 315 LEC Grow Light: \$22/month

Total hours: 558 light hours/month (grow lights are on 18 hours/day for 31 days)

LEC Grow Light Wattage: Total of 315W

At \$0.12/kWh (everyone is charged different rates, but this is about average for cities), the monthly cost of electricity for the light is ~\$21.

HOURS x COST/HOUR =

558 x (0.12 x 0.315) = \$21.09

Electricity Cost for Exhaust Fan: \$7/month

Total hours: 744 fan hours (fan is on 24 hours/day for 31 days)

Exhaust Fan Wattage: 75W

At \$0.12/kWh (everyone is charged different rates, but this is about average for cities), the monthly cost of electricity for the light is ~\$7.

HOURS x COST/HOUR =

744 x (0.12 x 0.075) = \$6.70

### \$0.25/kWh Electricity Cost – Estimated Total for 315W LEC Grow Light and Fans = \$58/month

This includes the cost of running the grow lights and fans if your electricity costs \$0.25/kWh (the typical cost of electricity in big cities in the US)

Electricity Cost for LEC Grow Light: \$44/month

Total hours: 558 light hours/month (grow lights are on 18 hours/day for 31 days)

LEC Grow Light Wattage: Total of 315W

At \$0.25/kWh (everyone is charged different rates, but this is typical for big cities), the monthly cost of electricity for the light is ~\$44.

HOURS x COST/HOUR =

558 x (0.25 x 0.315) = \$43.94

Electricity Cost for Exhaust Fan: \$14/month

Total hours: 744 fan hours (fan is on 24 hours/day for 31 days)

Exhaust Fan Wattage: 75W

At \$0.25/kWh (everyone is charged different rates, but this is about average for cities), the monthly cost of electricity for the light is ~\$14.

HOURS x COST/HOUR =

744 x (0.25 x 0.075) = \$13.95

## 400W HPS Electricity Calculations

### Estimated Total Electricity Cost for 400W Grow Light and Fans = \$96/month

This includes the cost of running the grow lights and fans.

Electricity Cost for MH/HPS Grow Light: \$56/month

Total hours: 558 light hours/month (grow lights are on 18 hours/day for 31 days)

MH/HPS Grow Light Wattage: 400W

At \$0.25/kWh (everyone is charged different rates, but this is about average for cities), the monthly cost of electricity for the light is…

HOURS x COST/HOUR =

558 x (0.25 x 0.400) = \$56

Electricity Cost for Exhaust Fan: \$23/month

Total hours: 744 fan hours (fan is on 24 hours/day for 31 days)

Exhaust Fan Wattage: 120W

At \$0.25/kWh (everyone is charged different rates, but this is about average for cities), the monthly cost of electricity for the light is…

HOURS x COST/HOUR =

744 x (0.25 x 0.120) = \$23

Electricity Cost for 1 Clip-On Fan: \$6/month

Total hours: 744 fan hours (fan is on 24 hours/day for 31 days)

Exhaust Fan Wattage: 30W

At \$0.25/kWh (everyone is charged different rates, but this is about average for cities), the monthly cost of electricity for the light is…

HOURS x COST/HOUR =

744 x (0.25 x 0.030) = \$6

Electricity Cost for Oscillating Fan: \$11/month

Total hours: 744 fan hours (fan is on 24 hours/day for 31 days)

Exhaust Fan Wattage: 55W

At \$0.25/kWh (everyone is charged different rates, but this is about average for cities), the monthly cost of electricity for the light is…

HOURS x COST/HOUR =

744 x (0.25 x 0.055) = \$11

## 600W HPS Electricity Calculations

### Estimated Total Electricity Cost for 600W Grow Light and Fans = \$128/month

This includes the cost of running the grow lights and fans.

Electricity Cost for MH/HPS Grow Light: \$84/month (based on \$0.25/kWh)

Total hours: 558 light hours/month (grow lights are on 18 hours/day for 31 days)

MH/HPS Grow Light Wattage: 600W

At \$0.25/kWh (everyone is charged different rates, but this is about average for cities), the monthly cost of electricity for the light is…

HOURS x COST/HOUR =

558 x (0.25 x 0.600) = \$84

Electricity Cost for Exhaust Fan: \$23/month

Total hours: 744 fan hours (fan is on 24 hours/day for 31 days)

Exhaust Fan Wattage: 120W

At \$0.25/kWh (everyone is charged different rates, but this is about average for cities), the monthly cost of electricity for the light is…

HOURS x COST/HOUR =

744 x (0.25 x 0.120) = \$23

Electricity Cost for 2 Oscillating Fans: \$21/month

Total hours: 744 fan hours (fan is on 24 hours/day for 31 days)

Exhaust Fan Wattage: 55W x 2 = 110W

At \$0.25/kWh (everyone is charged different rates, but this is about average for cities), the monthly cost of electricity for the light is…

HOURS x COST/HOUR =

744 x (0.25 x 0.110) = \$21