Are LED bulbs energy efficient?
At present, incandescent lamps are facing gradual elimination of the situation, energy – saving lamps become the mainstream of the market. In the market, it is not hard to find that energy-saving lamps become the main product, new LED lights are not hard to buy, and incandescent lamps have been difficult to find. From the appearance, the LED lamp not only has bulb ball but also has a lamp tube. However, the labeling of the outer package shows that the power of the LED lamp is much lower than that of an ordinary incandescent lamp.
The brightness of LEDs and CFLs selected is mainly based on the wattage corresponding to incandescent lamps marked on the packaging box. A 3-watt LED lamp with an illumination equal to the 25-watt incandescent lamp.
According to the data, many people still choose incandescent or energy-saving lamps, and there are not many customers for LED bulbs. “LED lights are too expensive.” LED lights are 16 times more expensive than other energy-saving or incandescent bulbs.
Incandescent Bulbs Consume The Most Electricity
So what are the practical effects of these common bulbs on the market? Here’s a comparison of three common bulbs on the market.
The three types of bulbs are incandescent, energy-saving and LED, with prices ranging from USD3.00 to USD49.80. The rated power of the incandescent lamp is 40 watts, and the rated power of CFL is 8 watts. The nominal power of the LED lamp is equal to 40 watts, while that of a LED lamp is 5 watts.
In the experiment, the three bulbs were connected to a 220-volt lamp holder in a darkroom, and the current was measured by an ammeter to measure the actual power of the bulb. At the same time, the packaging box of three light bulbs is placed 30 centimeters away from the bulb, and the reflection of the box is photographed with the camera with fixed exposure, so as to feel the difference between the three light bulbs directly.
By testing the current, the actual power of the three bulbs was quickly obtained. The current of an incandescent lamp is about 0.18 amperes, and the measured power is about 40 watts. The current of the energy-saving lamp is about 0.035 ampere, and the measured power is about 7.7 watts. The LED is about 0.021 amperes, and the measured power is about 4.6 watts. From these data, the incandescent lamp measured the highest power, is also the most power consumption.
LED Lights Are The Brightest And Coldest
So what about the actual lighting effect of the three bulbs? The same exposure combination was used to take a series of photos to record the reflection of different light bulbs on the box. The photos showed that the LED bulb had the highest brightness despite its nominal power of only 5 watts. Incandescents are slightly less bright, giving off yellow light that looks bright but feels relatively soft. Energy – saving lamp the shape of the tube is back, the luminous area is larger, but the color is white when looking directly at a bit harsh.
Same as 40 watts or equivalent to 40 watts, why is the lighting effect different? That’s because light from incandescent bulbs and CFLs diverges in all directions, while light from LEDs is emitted in a single direction, making them appear brighter than the other two bulbs.
In terms of heat dissipation, incandescent bulbs cannot be touched directly by hand due to the high temperature after 2 minutes of use. Although energy-saving lamps are obviously hot, it does not feel very hot if you hold the lamp with your hand. However, LED bulbs are very small.
LED Lights Are The Most Cost-Effective
At that price alone, buying an LED is the equivalent of buying 16 incandescent bulbs or nine CFLs. LED lights are obviously not as cost effective as CFLs and incandescent bulbs. However, taking factors such as power consumption and lamp life into account, the LED lamp’s lighting life is calculated at 15000 hours, equivalent to the sum of 15 incandescent lamps or 3 energy saving lamps. In terms of power consumption, incandescent lamps need to consume 600 degrees of electricity, energy-saving lamps are 115.5 degrees, while LED lamps are only 69 degrees.
Calculated at USD0.48 per kilowatt hour, the charge for 15,000 hours is USD333 for incandescent bulbs, USD139.44 for energy saving lamps, and USD82.92 for LED lamps. If used for a long time, LED light is the most cost-effective, and the best lighting effect.