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.
1 A good single-stage compressor, per true HP input, will deliver about 4 true CFM at 100 psig. 2  It is not uncommon to see this more like 3 CFM per HP. 3  A two-stage compressor is more efficient, typically by 15 percent, versus a single-stage compressor. 4  You might see 4 to 5 CFM per HP at 100 psi, instead of 3 or 4 CFM.