Led Light Output Vs Current

Older led chips found in older generation led bulbs from as recent as 2008 2010 produce less light per watt than the 2011 2012 led chips found in more modern led bulbs.

Led light output vs current. The light output of an led for a constant current varies as a function of its junction temperature. By driving led light sources with a regulated constant current power supply the light output variation and lifetime issues resulting from voltage variation and voltage changes can be eliminated. Figure 9 shows the light output of several leds as a function of junction temperature. Read the package to choose desired illumination level.

Here is wattage in its proper place. Also known as color temperature this indicates the quality of light ranging from warm yellow light to cool blue light. For example a 2012 7w bulb with a cree xt e chip can produce more light or lumen output than a 12w bulb with an older cree xp e chip. Lumens is best described as the measurement of light.

When choosing a bulb keep in mind the following. For example a 3w led is equivalent in output to a 45 w incandescent. To save the most energy choose the bulb with the lowest wattage suitable for its usage. Simply take your current incandescent watts and select the corresponding led bulb equivalent on the lumens brightness scale.

Another advantage of leds is the hassle factor leds last a lot longer than a regular bulb. Brightness is determined by lumens. Many different models and styles of led bulbs are available in today s marketplace. The temperature dependence is much less for ingan leds e g blue green white than for algainp leds e g red and yellow.

Sync your lights pumps and so much more. At low power levels the difference is even larger. What about cfl bulbs. Therefore constant current drivers are generally recommended for powering led light sources.

Pay close attention to lumens since this number indicates the brightness or light output of the bulb. In short led and cfl as technologies do not have a difference in brightness intrinsically. Bright led flood lamps use only 11 to 12 watts while creating a light output comparable to a 50 watt incandescent bulb. And with a shift to more energy efficient light.

A single cfl and led bulb might have the same lumen brightness output but vary greatly in the amount energy needed to generate that level of brightness.