Spectrum Test for Philips LED Downlight DN190B 5.5W

A friend wants to send me several of this LED downlight.
If I did not look closely and test, I’d not have accepted them.
I turn it over and over, and all housing is plastic.
Compared to the lights made of aluminum, this light feels cheap.

However, I take a closer look at the light, and realize it is Philips.
Its nominal power is 5.5 watts.
Although the shell is plastic, heat dissipation is not a problem.

The nominal luminous flux is 430 lumens, as high as an incandescent light of 50 – 60 watts.

I do a test with the integrating sphere and IES darkroom.
Surprisingly, the actual luminous flux is 450 lumens, 5% higher than the value marked on its box!
It gives more light for no additional costs.

Well, these big international brands are incomparable with those “smart” brands.
They are too honest.

Those “smart” brands usually indicate bigger values but actually offer lower values.
If they offer actual measurement of 450 Lumens, they dare to mark 500 or even 600 – 700 Lumens.

And look at other parameters.
The color temperature is marked as 4,000K, while the actual value is 4,060K, very precise.
This color temperature can be used inside the house, and it’s very comfortable.

Downlights are generally installed on the ceiling.
And usually, more than one light is installed together.
So, the consistency of the color is very important.
Otherwise, one light glows red, and the other glows blue.
The ceiling won’t look good.

If a wedding house’ decoration looks like this, the mother-in-law will repent seeing this. 😊
If an old couple decorates their house like this, the wife will be furious seeing the result. 😊
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In order to avoid such a situation that affects the harmony of a customer’s family, quality inspection companies like BackMorning will check a critical parameter of LED lights.