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Introduction:Luminous efficiency of various lamps

When buying lamps or light sources, we often ask'how much watts does this lamp have', or say directly to the salesperson,'I want a 15-watt bulb'. This power data reflects only an indicator of power consumption, but our subtext is actually to want a light with that brightness.

Even with the same 15-watt incandescent lamp, fluorescent lamp, energy-saving lamp and LED lamp, the brightness of their lighting is not the same, and the difference is far. Why is this?

It is because different types of lamps with the same power have different luminous fluxes.

Luminous flux is the amount of light emitted by the light source in a unit of time. Illuminance is the luminous flux per second, and the unit is lumens. This value reflects the amount of visible light that human eyes can actually receive. That is to say, it is a parameter based on human perception and an objective manifestation of'there is that brightness'.

Therefore, we can also say to the salesperson:'I want a 60-lumen light bulb. 'However, few salespersons can understand our needs, and few products will indicate the number of lumens on the packaging.

Luminous efficiency is a parameter of a light source, it is the ratio of luminous flux to power. Different types of light sources have different luminous efficiency. Generally speaking, the luminous efficiency of incandescent lamps is about 10-15 lumens/watt, and the luminous efficiency of energy-saving lamps is 50-100 lumens/watt. The range of LED lamps is also relatively wide. It ranges from 60 to 120 lumens/watt.

Generally, 300 to 350 lumens per square meter is sufficient for living rooms and offices. There is a simple algorithm, such as the power of the LED lights required for a 30 square meter office space, that is, 30*3=90 watts, which means that a 30 square meter living room needs a 90 watt LED light to meet the demand.

In principle, to achieve the same luminous flux, LED lights only need lower power, so LED lights are a new generation of energy-saving and environmentally friendly light sources.