montly prices when using hids

How much does it cost to operate my indoor garden lighting system?
Below is a table based on operating the light only 12 hours a day at 8 cents per kilowatt hour. Check your electric bill for your electric rate. Wattage Estimated monthly cost 150 $4.97 250 $8.28 400 $13.25 1000 $33.12 To calculate your energy cost you will need to know 3 things: A: Your cost of energy (usually identified as "KWH" charge on your electric bill) B: The total watts of your lighting system C: The total operating hours ("ON" time) of your lighting system per month. Formula = A * B/1000 * C = Total Energy Cost per month So for the above table: A = $.08 , B = 460, C = 360 hours (12 per day * 30 days) = Total charge of $13.25

Primary light (no natural light) coverages for the different grow light wattages are as follows.

• 100 watt lights: 1.5FT x 1.5FT growing area
• 150/175 watt lights: 2FT x 2FT growing area
• 250 watt lights: 3FT x 3FT growing area
• 400 watt lights: 5FT x 5FT growing area
• 600 watt lights: 6FT x 6FT growing area
• 1000 watt lights: 8FT x 8FT growing area

yup been a few posts on this figuring and in the fact is a link to a calculator that will do all the math for you and the kilowatt hours used.