Is there a relationship between the power of led solar street light and the number of lamp beads?

There is a saying in the market: the more LED lamp beads, the brighter the lamp.

In fact, there are a lot of cheap SMD chip lamp beads in the market, each of which is only 0.01W-0.08W. However, many merchants take advantage of loopholes and dare not communicate honestly. They simply and rudely tell consumers by counting the number of lamp beads: "One lamp bead is one watt. The more lamp beads, the greater the wattage, and the brighter the lamp."

Solar led Street Light JD-SL1072

This kind of behavior is simply entertaining the public's IQ!

In fact, there is no necessary relationship between the brightness of a lamp, its nominal wattage, and the number of lamp beads.

Some manufacturers completely use the number of lamp beads to randomly mark the wattage, corresponding to the data of the battery board and battery capacity, and the lighting time. It is a joke for a discerning person: Calculated in this way, the daily lighting time is only tens of minutes.

Only 100W is marked on the casing, but other configurations (44Ah capacity battery, polycrystalline 45W solar panel) are even lower than the standard manufacturer's 30W configuration!

Is the brightness of solar street lights related to the number of lamp beads?

The unit that really measures brightness is the lumen. The brightness of the whole lamp depends on the luminous flux.

Lumen refers to the measurement of the output light of the lamp, which is used for the brightness of the indicator light. Wattage refers to the energy consumed by a lamp in a certain period of time. When it comes to brightness, it's more important to look at a fixture's lumen rating than wattage.

It is also a 15W LED light source. The luminous efficiency of brand A light source is 80Lm/W, while the luminous efficiency of brand B light source is 200Lm/W. The luminous flux comparison is: At this time, we will find that although the two have the same wattage, the LED light source of brand B is brighter . Going deeper, the 14w luminous flux (2*15W*80Lm/W)=2400Lm of the two LED light sources of brand A is still no brighter than a single 15w LED light source of brand B.

The quality of lamp beads depends on the raw materials. This is the so-called "you get what you pay for". Taobao and Pinduoduo buy so-called 50W and 100W for tens of dollars. You can just buy a firefly toy and go home. It is only about 5W-10W, don't expect it to be very bright.

There are also some merchants who deliberately set the lights to the "blinding" mode some time ago for the sake of gimmicks. However, the remaining power is limited and cannot support the rest of the long night, and it turns off the lights when it gets dark.

There was once a customer who bought solar lamps densely packed with lamp beads at a very high price-performance ratio. In his own words, he never saw these lamp beads light up at the same time.