**Table of Contents**

## 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

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

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

**$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

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

HOURS x COST/HOUR =

744 x (0.25 x 0.110) = $21