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.
(watts of lamp divided-by 1000) times 24 hours times cost of electricity per KWH For example, if your area electricity costs are $0.12 per KWH and you want to know how much it will cost to run a 75 watt lamp (of any type) for 24 hours, the cost would be (75 / 1000) x 24 x 0.12) == $0.216, or 21.6 cents per day.