The luminous efficiency of LED bulbs and energy-saving bulbs is very different

In the past, when we bought light bulbs, we often used the logic of tungsten filament light bulbs, thinking that the higher the wattage, the brighter the light bulbs, so there are 100 watts, 60 watts, 40 watts... and so on. However, with the advancement of technology, the brightness that can be produced per watt of different light bulbs has been continuously improved, so the more suitable brightness should be the brightness unit lumens (lm).

The luminous efficiency of LED bulbs and energy-saving bulbs is very different

In the past, a 100-watt light bulb can produce 1520 lumens, but for an energy-saving light bulb, as long as a 27-watt energy-saving light bulb can have the same lumen brightness, an LED light bulb only needs 15 watts to produce the same brightness.

To further understand the relationship between the wattage and the brightness of different bulbs, we must first understand what is luminous efficiency (Luminous Efficacy), and some manufacturers call it "luminous efficiency."

Luminous efficiency represents the efficiency at which the light source converts the consumed electrical energy into light, expressed by the ratio of luminous flux to power consumption, and its unit is lm/W. The consumed electrical energy is measured by the actual power consumption of the input electrical energy in watts, and the luminous flux is measured by the sum of the luminous fluxes (total luminous flux) emitted by the light source in all directions, and the unit is lumens (lm).

In the simplest way, the higher the luminous efficiency, the higher the efficiency of converting electrical energy into light, that is, the less electrical energy is consumed to emit the same luminous flux. So this will directly affect your electricity bill.

Generally speaking, the luminous efficiency of the power saving bulb is about 60 lm/w, and the luminous efficiency of LED is about 90-100 lm/w.

So we can get a simple conversion method. Assuming that a 27-watt energy-saving bulb has a luminous efficiency of about 60 lm/w, then the number of lumen is 27x60=1620 lm. When converted to an LED bulb, 100lm/w is equivalent to a 16-watt LED bulb.

In addition, there is actually the problem of the light-emitting angle. If the energy-saving bulb is designed as a spiral bulb, the light-emitting angle is 360 degrees, and the LED is 180 to 270 degrees. But we will not discuss this issue here.

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