1800lumens per watt
Generally lumen is a measure of the total amount visible light form a lamp or light source. LEDs are about the same as CFLs, producing about 50 lumens per watt, compared to 10 lumens for incandescent bulbs or 13 lumens for halogen.
A 12 LED M11 bulb typically produces around 200-300 lumens of brightness, depending on the specific brand and quality of the LEDs used. This is equivalent to a 20-30 watt incandescent bulb.
For a halogen xenon you'll get a max of about 30 lumens per watt, but more likely around 20. So for a 50 w you get around 1000 lumens.
To determine the answer you need to know the efficacy (luminous flux) of the LED light which may range from 30-90. You can use 60 for an average. Multiply the watts from an incandescent bulb - what you are familiar with - say 40 watts x the LED luminous flux 60 = comparable lumens of about 2400 to see the same brightness.
Yes, the halogen bulb would provide about 30% more brightness (lumens) for the same electric power rating. So 70 watt halogen is about equal to 90-100 watt incandescent.
Amps * Volts = Watts Since you know the Watts, determine your voltage to determine the Amps. For example, if you are using 120 volts: Amps * 120 = 30 and from basic algebra Amps = 30/120 Amps = .25
If the two bulbs use the same technology the 100 w bulb is 10/6 times brighter than the 60 w. Incandescent bulbs give about 10-12 lumens per watt Halgogen gives about 15-18 lumens per watt CFL (low-energy) gives about 50 lumens per watt.
15 led 2 weeks 30 or 60
18 W per LM. Yang and Huang have recently achieved the highest lumens per watt ever recorded for a red phosphorescent LED using a new combination of plastic, or polymer, infused liquid - and they did it at half the current cost. Yang and Huang's latest record will be presented at the Society for Information Display 2007 conference in Long Beach, Calif., from May 20 through 25."It's a much simpler, lighter, thinner and more elegant answer to creating a better LED product," Yang said.Yang began his high-performance PLED research at UCLA Engineering in early 2003 with a then-graduate student named Qianfei Xu, who was part of the professor's research group, and achieved a record-high efficiency for green PLEDs."The current results represent our ongoing quest to create better, slimmer, less expensive high-performance PLEDs," Yang said. "Using our simple solution method, we already have successfully achieved several world records in device efficiency, including 20 lumens/watt white emission fluorescent PLEDs, 30 lumens/watt green emission fluorescent PLEDs and 18 lumens/watt red emission phosphorescent PLEDs. So our latest red emission PLED is just one of our multiple records. It's a very exciting development."The new technology, which already has been licensed by Canon, should be available to consumers in about three years.Source: UCLA
Some LED lights are manufactured to run on low-voltage, usually 12 v, while others are manufactured to run on the local supply voltage, usually 110/120 v or 230/240 v.
Car headlights typically range from 35 watts to 55 watts for halogen bulbs, while newer LED headlights can range from 15 watts to 30 watts. The brightness of a headlight is measured in lumens rather than candle watts.
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