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.
Most computers run in the 350-800 Watt range. Look at your electric bill for the amount you pay per kiloWatt hour. (One kiloWatt hour is 1,000 Watts for one hour.) An 800 Watt computer uses 0.8 kiloWatts per hour. Simple arithmetic will tell you about how much your computer costs to run.