1. Luminous flux
For lamps of the same type, this parameter must exceed the minimum limit, and the higher the better.
2. Power
When the luminous flux meets the demand, the smaller the power, the better.
3. Color temperature
Generally, the color temperature of LED lamps is better between 4000K-5000K, and 2700K-3000K should be selected in the bedroom and other places that need a sense of sentiment and comfort.
4. Color rendering index Ra
The national standard stipulates that the daily use requires Ra to be greater than 80.
5. Life
The life of the lamp actually has two parts, the shorter one is taken as the life of the whole lamp.
1) The time required for the luminous flux of the whole lamp to decrease to 70% of the initial value;
2) The time from ignition to the burning of the whole lamp;
For LED lamps, the second one is much shorter than the first one. The national standard stipulates that the life of the whole lamp is greater than 25,000 hours.
6. PF value
The PF value is the ratio of the actual power consumed by the lamp to the apparent power. This item is not a parameter of the quality of the lamp but is only related to the load of the power grid. Thanks to the low power consumption of the LED lamp, the impact is limited. However, some sales staff often claim that the higher the PF value, the more energy-saving and the better the quality of the lamps. This is unfounded.
