Why do LED bulbs of the same wattage have different brightness levels?

① Different light source efficiency

LED lights both consume electricity and emit light. This involves conversion efficiency. The light efficiency index is in the form of lm/w. This refers to how many lumens of luminous flux can be converted per watt of electrical power. When LEDs were first created, their time efficiency was only a few tenths of a lumen per watt. Today, quality LED beads can reach 200lm/w, which is a difference of thousands of times. So far, the luminous efficiency of LEDs has been updated every year. Therefore, it is not surprising that the brightness of the same size bulb assembled with beads from different periods or different manufacturers is not the same.

② Differences in power efficiency

LED lamp beads are non-linear components with negative temperature, extremely sensitive to changes in temperature and voltage. Therefore, neither the AC power supply or DC power supply can not directly for the LED power supply, but need constant current drive to work. The efficiency of constant-current drivers of different qualities varies greatly, from 50% to 90%. Therefore, even if you choose a high-efficiency light source, if the constant-current driver is inefficient, it will result in insufficient brightness.

③ Power labeling based on different

Currently, the power labeling in the LED lighting market is quite confusing. Some are based on the actual power consumption of the entire lamp, while others are based on the power of the lamp beads. Since the efficiency of the power supply cannot reach 100%, LED bulbs with the same power may be labeled as different power by different manufacturers.

④ Different areas of the light emitting parts

Two different shaped bulbs of the same wattage sometimes seem to have very different brightness. For example, a small bulb looks brighter than a large bulb. A light bulb looks brighter than a lamp, etc.