Skin inflammation (dermatitis) sometimes develops around a venous ulcer. Non-venous skin ulcers are less common. For example, a skin ulcer may be caused by poor circulation due to narrowed arteries in the leg, problems with nerves that supply the skin, or other problems. The treatment for non-venous ulcers is different to that of venous ulcers. The rest of this leaflet deals only with venous leg ulcers.
But with the new lumen measurement, you can know exactly, without guessing, the brightness of light a certain number of lumens will produce. Let's consider some examples that compare and convert watts to lumens: â¢ 1  A 40-watt incandescent bulb equals around 450 lumens. â¢  A 60-watt incandescent bulb equals 800 lumens.
Step A: Convert watts to amps. Actually, watts is the fundamental unit of power and watt-hours is the energy stored. The key is to use the watts you know to calculate the amps at the battery voltage. For example, say you want to run a 250 watt 110VAC light bulb from an inverter for 5 hours. = I*t. where Q is the charge in coulombs, I is the current in amps and t is the time in seconds. The amount of charge passing through that wire (conducting 1.0 amps) in 60 seconds is 60 coulombs, and in one hour you would have had said hello and good-bye to 3600 coulombs of charge.