Allegedly polyspectral fitolamp for allegedly 80 watts

In the Lamptest project, I test for free any LED lamps that can be bought in stores. One of the site visitors sent me a phytolamp for dough, which he bought on Aliexpress. The claimed lamp power is as much as 80 watts, promising a full spectrum, including blue, red, white, ultraviolet and infrared light and a luminous flux of 2500 lm.

The lamp is huge - 125 mm in diameter, weighs almost half a kilo.

The lamp has 120 LEDs: 78 red, 24 blue, 6 white, 6 infrared and 6 ultraviolet.

Let's start with the simplest - measuring power consumption.

A voltage of 230V ± 0.3% was applied to the lamp from the Stable Instax 500 double conversion stabilizer . After a half-hour lamp warm-up, the accurate Robiton PM2 power meter showed a value of 23.43 W, which is almost four times less than what the seller had promised.

The luminous flux value was measured using a Viso LightSpion instrument . The device showed only 603 lm, which is more than four times less than the promised. I admit that the device designed to test lighting lamps on fitolamps may be wrong, but certainly not four times.

LightSpion measures electrical parameters a little less accurately, so the values ​​of voltage and power in the screenshot are slightly different from the real ones.

The seller lists the following parameters of the lamp spectrum:

Light Spectrum:
Red: 630nm ~ 660nm
Blue: 430nm ~ 460nm
IR: 730nm
UV: 380nm
White: 6500K

The spectrum was measured using a UPRtek MK350D spectrometer.

The maximum spectrum of the lamp is fixed at a wavelength of 629 nm (red). This is lower than stated (630nm ~ 660nm).

The second peak is blue 456nm (83% of the maximum level).

There are only six white LEDs in the lamp and they give less than 5% of the total luminous flux, so their effects on the spectrum are almost negligible.

The UV peak does not occur at 380 nm, but at 399 nm — this is already visible purple light. The near ultraviolet is 300-400nm . The peak level is 14% of the maximum.

Infrared peak at 737nm, its level - 9% of the maximum. In fact, this light can not even be considered infrared, because the near-infrared range starts at 740nm .

I’m not a nerd and I can’t say whether a small amount of white light, UV light and infrared light at the edge of the visible range affects plant growth, or is it just a marketing ploy.

But I can definitely say that the seller’s power of the lamp is four times deceiving customers, which gives every reason to demand a return of 3/4 of the $ 20.84 spent through a dispute.

PS The lamp was bought here .

© 2017, Alexey Nadyozhin


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