To determine an LED's power consumption, just multiply the LED's voltage (in volts) by the LED's current (in amperes). The result, in watts, is the amount of electricity used by your LEDs. If your LED has a voltage of 3.6 and a current of 20 milliamperes, it will consume 72 milliwatts of electricity. A typical household wall outlet provides about 120 volts, so your LED needs to be able to handle that level of stress or it will burn out prematurely.
An LED's voltage range determines how many different colors it can produce. An LED that can produce red, green, and blue light from its base material would have a maximum voltage of 2.5. Such an LED could only produce white light by combining all three colors, which requires special treatment of the electrical signal.
LEDs are very efficient at converting electrical energy into light energy. The efficiency of individual LEDs varies, but they average about 90 percent. That means that for every watt of power that goes in, almost nine watts come out. As a rule of thumb, if an LED product's specifications list an output of one hundred thousand hours, then it uses one watt of power all the time it's on.
An LED lamp will usually specify both its power consumption and its lifetime expectancy.
An LED light utilizes 30 watts in a very different way than an HPS lamp. The lumen, which indicates the quantity of light generated by a bulb or lamp, is the current unit for measuring brightness. Let's have a look at our HPS to LED conversion chart to see what we mean. 70 watts HPS = 40 watts LED A 100-watt HPS bulb is the same as a 50-60-watt LED bulb. Because LEDs are more efficient, they require less electricity to operate.
In conclusion, an LED light source requires less power than an HPS lamp but it must be taken into account that they last much less time. However, these disadvantages can be overcome by replacing the old HPS lamps with new LED equivalents.
High-power light-emitting diodes (LEDs) can use up to 350 milliwatts in a single LED. The majority of the power in an LED is converted to heat rather than light (about 70 percent heat and 30 percent light). A small amount of that energy is lost as light, but most is lost as heat.
The temperature of an object determines how much energy it will absorb or emit. If you know these two things about two objects: one has been heated while the other has not; and both are cooled to room temperature, then you can calculate how much heat was transferred from one to the other.
You can estimate how much heat was transferred by any object that you have measured its temperature before and after contact with another object. For example, if you heat one end of a piece of wire and measure its temperature, you can estimate how much heat was transferred to the wire by measuring how much it cooled when you touch it to another object at room temperature.
Energy transfers between objects always result in some degree of heating or cooling. But if an object is brought into thermal contact with another object that is already at a high temperature, most of the energy will be absorbed by the cooler object, without being transmitted to the hotter one.
Heating an object increases its internal energy level.
So, we know power (W) = current (A) x voltage (V). Power is given as 9 watts. Voltage is assumed to be 120 volts. So a 9-Watt light bulb plugged into a 120-Volt lamp will have a current of 0.075 Amps. How many amps does a 9-watt LED bulb draw?
| Incandescent Light Bulb Wattage | LED Equivalent Wattage |
|---|---|
| 100 Watt | 10 Watt |
| 75 Watt | 7.5 Watt |
| 60 Watt | 6 Watt |
| 50 Watt | 5 Watt |
For example, our LedsUniverse high power LED lights have a ratio of 1 to 2.5, which means you need to buy a 400 watt or 500 watt LED light to replace a 1000 watt metal halide led. These are the only two options available from any manufacturer.
However, there is a third option: low power LEDs. These come in three forms: micro-LEDs, RGB LEDs and laser diodes. Micro-LEDs are very small -- one thousandth the size of a standard LED -- but they can produce very bright light because there are many of them on each chip. Rgb LEDs can be used in place of fluorescents by combining red, green, and blue chips in different ratios to create almost any color. Laser diodes are just like regular LEDs except that they emit light in the infrared spectrum instead of visible red. They are used with photovoltaic cells to monitor movement and open doors without disturbing what is behind them.
The advantage of low power LEDs is that you can use a lot of them to produce the same amount of light as a single high power LED. For example, our LedsUniverse mini LED light has 24 micro-LEDs inside but only uses 3 watts of power. It's also much smaller than other low power LED fixtures because it doesn't need a driver circuit or heat sink.
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