You must double your wattage by 1,000. (1,000 kilowats in 1 watt). So, if we run a 1000 watt grow light 18 hours a day at the kWh pricing we mentioned previously, our formula would be: 1 x $0.1559 x 18 x 30 = $84.186/month. However, we recommend not running your lights for more than 12 hours per day to avoid excessive energy consumption and higher costs.

Also, remember that you will need to provide electricity to your grow light, so make sure that you have **a reliable source** of energy available. A battery-powered system is best because it does not waste energy when it is not being used. Batteries can be replaced though, so overall efficiency is very high.

Running **my lights** for 18 hours a day means I'll be using up nearly $100 of electricity each month! This is too high of an expense to be sustainable, as we will need to spend another $100 on electricity every month just to keep up with demand. A better model would be to run your lights for only six hours per day, which would require only half as much electricity.

This shows that it is not efficient or practical to use 1000 watts of power all day every day. Even at **half that amount**, your plants will still be using **2000 watts** of power for most of the year, which is extremely wasteful!

50 W Halogen: 50W x 8 hours = 400/1000 = 4 x $. 30 kWh = $. 12 for one day of running one halogen lamp for 8 hours. This means that each bulb uses about.02 kWh per hour.

So, the total cost of electricity to run your lamp for **one hour** is about.02 x 60 = $.12.

The other way to look at this is that it will take **about 12 dollars** in electricity to light up **your room** for an hour. This is called "lighting a 100-watt bulb for one hour".

This number can be used with other numbers you know to get **more accurate results**. For example, if your monthly utility bill is $120 then it will take about 1 month to pay for the lamp on average. If your monthly bill is $180 then it will take about 3 months to pay for the lamp.

Here are some more examples:

If your monthly bill is $60 then it will take about 10 days to pay for the lamp.

If your monthly bill is $120 then it will take about 1 month to pay for the lamp.

84,420 = 670 x 0.15 x 12x7x10 (pence) So, throughout a ten-week period, your "600w" bulb will cost you a total of PS84.42 in power. Not too bad!

Your 0.015 kW fluorescent light operates for 3.5 hours each day, two days per week. It will be on for about 3.5 hours per day* 2 days per week* 4 weeks per month = 28 hours per month in one month. That is about 300 minutes per month or 3 hours 30 minutes per week. Its average power consumption is then about 315 watts (0.015 x 3000). The total number of LED bulbs required is then about 63.

Your 0.15 kW fluorescent light operates for **3.5 hours** each day, five days per week. It will be on for **about 33 hours** per week* 5 days per week* 4 weeks per month = 165 hours per month. That is about 495 minutes per month or 6 hours 15 minutes per week. Its average power consumption is then about 49.5 watts (0.15 x 3000). The total number of **LED bulbs** required is then about 123.

Your 1.5 kW fluorescent light operates for three and a half hours each day, five days per week. Its average power consumption is then about 49.5 watts (1.5 x 3000).