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.
That's quite a range, $5.50 to $631 a year. It really depends on what kind of computer it is, how much you use it, and your local rate for electricity -- and especially whether you turn off the computer when you're not using it (or at least sleep it).Both the examples above are extremes. typical desktop computer uses about 65 to 250 watts. To find the figure for your particular computer you can contact the manufacturer (not me), or see my section on measuring electrical use. Add another 20-40 watts for an LCD monitor, or about 80 watts if you have an old-school 17. CRT.