To replace a 100-watt incandescent bulb, look for a bulb that gives you about 1600 lumens. If you want something dimmer, go for less lumens; if you prefer brighter light, look for more lumens. Replace a 75W bulb with an LED bulb that gives you about 1100 lumens. Replace a 60W bulb with an LED bulb that gives you about 800 lumens. Replace a 40W bulb with an LED bulb that gives you about 450 lumens.
https://www.earthled.com/pages/lumens-watts-and-buying-lightbulbs-in-the-21st-century
When you're reducing fixtures, you're reducing energy.. Not only do electronic ballasts require up to 40 percent fewer fixtures to light an outdoor field and fewer input watts (1,565 compared to a magnetic ballast's 1,625) to get 1,500 watts of output per fixture, they also are much easier on the lamps themselves.
http://www.athleticbusiness.com/outdoor/led-technology-poised-to-revolutionize-outdoor-sports-lighting.html
Most solar lighting systems use fixtures ranging from 20 Watt LED (2000+ Lumens) to 90 Watt LED (9000+ Lumens) and are typically in the 35 Watt to 50 Watt range for most applications. High security or light level requirements use the brighter lights and residential and remote areas use the lower range.
http://www.sepco-solarlighting.com/blog/wattage-vs-lumens-know-the-difference-for-better-lighting
Rather than provide lighting design. “templates,” this guide identifies lumen packages that would be necessary for. various applications. Lighting applications are categorized as a function of lumens required for achieving. the illuminance levels. The lumen values were derived from IES recommendations.
http://www.lrc.rpi.edu/programs/solidstate/assist/pdf/LED-lighting-apps-guide-2002.pdf
Now choosing lights: A typical well built LED downlight provide 80-110 Lumens per watt, let’s consider 100 lumens. So we need total of 20W LED light to get 2000 lumens and 150 Lux for our sample bed room. That means number of LED lights = 20w( total light)/5W(single light) = 4. If you consider florescent tube or CFLs, they provide 60 lumens per watt, but in all directions. So you need more than 35W to get sufficient lighting.
http://www.charlstonlights.com/blog/led-light-quantity-how-many-much
In 2014, LED equipment in an average application might cost 50 percent more than HID, says Musco Lighting CEO Joe Crookham, whose company's metal halide lighting solutions currently illuminate seven Major League Baseball parks and countless outdoor sports venues worldwide.
http://www.athleticbusiness.com/outdoor/led-technology-poised-to-revolutionize-outdoor-sports-lighting.html
To calculate vertical lumens, typical task area heights were used to provide. wall area in square feet. As the amount of lumens per LED improves with time, this document will aid in. identifying the potential applications for LED lighting.
http://www.lrc.rpi.edu/programs/solidstate/assist/pdf/LED-lighting-apps-guide-2002.pdf
The brightness, or lumen levels, of the lights in your home may vary widely, so here's a rule of thumb: 1  To replace a 100-watt incandescent bulb, look for a bulb that gives you about 1600 lumens. 2  Replace a 75W bulb with an LED bulb that gives you about 1100 lumens. 3  Replace a 60W bulb with an LED bulb that gives you about 800 lumens.
https://www.earthled.com/pages/lumens-watts-and-buying-lightbulbs-in-the-21st-century
A lumen is the amount of light a certain lamp gives off. If replacing a standard 150 Watt light bulb which gives off around 2600 Lumens, using a 42 Watt CFL or a 25 Watt LED is about the equivalent. This lowers the needed power of the light by over a quarter of the required power to produce the same light.
http://www.sepco-solarlighting.com/blog/wattage-vs-lumens-know-the-difference-for-better-lighting
Standard lamps are round and provide light / Lumens in all directions, whereas the LEDs push the light directly to the area it is needed. One of the biggest mistakes are people making the switch from older lamps at around 400 Watts and only moving down to a 300 Watt LED. A much lower wattage LED can be used.
http://www.sepco-solarlighting.com/blog/wattage-vs-lumens-know-the-difference-for-better-lighting
how much led lumens needed for outdoor lighting
1,565 light-emitting diode lumens are needed for outdoor lighting. 1,565 LED lumens are needed for outdoor lighting.