Which light source is more suitable for reading?

2020-12-24

1. Incandescent lamps, tungsten halogen lamps (note that there is also a metal halide lamp, with different principles and gaps in color rendering), low-quality energy-saving lamps, and low-quality LEDs. The strobe is more obvious (keyword: strobe depth). This information is basically not available on the Internet. If you are interested, you can watch the measurement results of EERE and other institutions. You can also use the photosensitive element to connect to the oscilloscope. Anti-stroboscopic algorithm of the camera) look. In addition, the stroboscopic frequency of incandescent lamps, halogen lamps, and energy-saving lamps is not 50Hz, but 100Hz. Energy-saving lamps with high frequency tens of thousands of flashes per second are actually 100Hz. Brainless publicity in the market has confused the operating frequency of the switching power supply with the frequency of the output ripple.

2. The color rendering of incandescent lamps and halogen tungsten lamps seems to be perfect, but this is because the color rendering index itself uses black body radiation as the benchmark when the color temperature is low. In fact, in recent years, academia has advocated examining the two factors of GAI and CRI as standards, while incandescent and halogen tungsten lamps are not very good in GAI. The specific manifestation is that they have poor color resolution and feel annoying. For serious study and work, it is recommended to use a higher color temperature light source, such as 4500K-5000K color temperature, which is close to the natural sunlight outdoors, which is more suitable.

3. Theoretically speaking, LED should not flicker, but due to cost and PF (power factor correction) reasons, most of the current drivers will flicker.

In short,

If you want to be economical and cost-effective, it is recommended to choose a three-primary energy-saving lamp with a color temperature of 4500-5000K.

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