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 many watts does a normal 4 person family use. You can find this on your electric bill. It varies widely but generally about 800 to 1500 KWH per month. 1 KWH = 1000 watts for 1 hour or 100 wats for 10 hrs ect. 1 kwh costs about $.08 to $.15 depanding on the utility rates where you live. This Site Might Help You.