More and more manufacturers are starting to produce LED lamps with improved color rendering, and this is good news.
Light bulbs "Photon X", produced by the St. Petersburg company Rosel, appeared on sale.
The "Photon X" series consists of conventional and filament lamps with warm (3000K) and neutral (4000K) light. These are "candles" with E14 base and "balls" with E14 and E27 bases. All bulbs replace a 60 watt incandescent bulb and give 600-700 lumens. Conventional lamps have a declared color rendering index CRI (Ra) of more than 90, filament lamps have more than 95.
I tested two lamps of each model. All measurements were taken after the lamps had warmed up for at least 30 minutes. Luminous flux, color rendering index, color temperature and ripple were measured using an Uprtek MK350D spectrometer and a half-meter integrating sphere. The ripple factor was measured at supply voltages of 230, 220 and 207 volts. The power consumption was measured using a Robiton PM-2 instrument at a supply voltage of 230 V provided by a Shtil Instab 500 inverter stabilizer. The voltage at which the luminous flux decreases by no more than 5% of the nominal voltage was recorded using the Lamptest-1 device and the Suntek TDGC2-0.5 LATR.
Let's start with the results of conventional non-filament lamps.
The power of all lamps is slightly less than indicated (but within the permissible 10%), the luminous flux of most lamps is more than indicated (by 1-23%), only for "warm" candles it is 3-4% less than indicated.
Color rendering indexes are really high: 93-95 for warm light lamps and 91 for neutral light lamps.
The lamps are built on pulsed (IC) drivers and actually have a built-in regulator that allows them to operate in a very wide voltage range (140-240 V).
There is practically no light pulsation, with switches that have an indicator, the lamps work correctly.
Spectra and color parameters on the example of "candles" with warm and neutral light.
Let's move on to the results of my measurements of the parameters of filament lamps "Photon X".
The measured power consumption for all lamps is 6.1-6.5 W, which is slightly lower than the declared 7 W.
The measured luminous flux for all lamps is 14-23% higher than the declared one.
Color rendering index CRI(Ra) 96-98.
The lamps are built on linear drivers, so when the mains voltage decreases, their brightness decreases (the voltage at which the brightness drops by 5% is indicated in the Umin column) and a ripple appears.
At a voltage of 230 V, the pulsation of light is practically absent. At 220 V, the "balls" with the E14 base still have no pulsation, the "balls" with the E27 base appear pulsation 4-6%, for "candles" up to 16% (such a pulsation is not visually distinguishable and is comparable to the pulsation of lamps incandescent). At 207 V (this is the minimum voltage in the network according to GOST - 230V minus 10%), the ripple coefficient is 28-45%, such a ripple is already slightly noticeable visually.
All lamps work correctly with switches that have an indicator.
Spectra and color parameters on the example of filament "candles" with warm and neutral light.
Non-filament lamps have a single board that houses both the LEDs and the driver (DOB). 10 LEDs are used. The switching driver chip is the smallest (it is marked U1 on the board). The chip says "628M04" in the first line and "125At" in the second. I could not find any information about this chip on the Internet. Yunxing condenser with 105°C allowable temperature. There is only one current-setting resistor (RS1), the second resistor (RS2) is not installed. In the photo on the left is a "candle", on the right is a "ball" E14.
Using the Seek Thermal thermal imager, I measured the temperatures of the lamps after 30 minutes of operation. The board temperature was measured immediately after the diffuser cap was removed.
The maximum glass temperature of filament lamps is 52-53°C. In the area of the driver board near the "ball" with the E14 base, the thermal imager shows 57°C.
Housings of non-filament lamps heat up to 78-81°C.
The maximum temperature on the board at the "candle" is 104°C, at the "ball" 91°C.
It is believed that in order for modern LEDs not to quickly degrade and fail, the temperature on them should not exceed 105 ° C.
Non-filament lamps Photon X cost 190-210 rubles, filament lamps 200-220 rubles. They can be found on Ozone and Wildberries.
Filament lamps can be used where the mains voltage is stable and always above 220 V. Where the voltage often drops below, it is better to use Photon X non-filament lamps.
P.S. Photon lamp test results on Lamptest.ru: lamptest.ru/search/#&brand=Photon.
© 2022, Alexey Nadezhin
For ten years I have been writing every day about technology, discounts, interesting places and events. Read my blog site ammo1.ru, v Learn, Zen, Mirtesen, Telegram.
My projects:
lamptest.ru. I test LED lamps and help you figure out which ones are good and which are not so good.
Elerus.ru. I collect information about domestic electronic devices for personal use and share it.
You can contact me on Telegram @ammo1 and by mail [email protected].
#led#light bulbs#lamps#LED lamp#photon#cri#lamp test