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.
400w HPS = 50000 lumens = 125 lumens/watt. 600w HPS = 90000 lumens = 150 lumens/watt. So you can see that HPS is more efficient than CFL...and as you get into bigger HPS bulbs, it becomes a lot more efficient. There's also fewer hassles with multiple cords and saved money on your energy bill. PAR watt directly indicates how much light energy is available for plants to use in photosynthesis. The output of a 400 watt incandescent bulb is about 25 watts of light, a 400 watt metal halide bulb emits about 140 watts of light.