The main objective of a physical map is to show landforms, bodies of water and other geographical features. Features shown include mountains, deserts and lowlands as well as lakes, rivers and oceans.
Depending on your electricity prices, a 400 watt HID will cost $200 â $400 each year of use, plus the cost of replacement bulbs. LEDs meant to replace 400w HIDs average around 180 watts.
How much does it cost to run a 100 watt bulb? If you run a 100 watt bulb for 10 hours you would 1 kilowatt hour  (kWh). The cost of electricity varies by location usually. Mine  even has a sliding scale based on the usaâ¦ge and goes from $.08 to  $0.25 per kWh. Look at your electric bill to see if it shows a rate  per kWh. If it does not, divide the dollar amount of your bill by  the total kWh used to get a rate per kWh. That will be the cost to  run a 100 watt bulb for 10 hours.