The online store Ledroid.ru, which has long supported the Lamptest project and provided more than one hundred lamps for testing, began selling LED lamps under its own brand. These are G9 and G4 12V lamps, which from other manufacturers are either expensive or not very high-quality and R7s lamps that are difficult to find from other manufacturers.
For all lamps, the color rendition index (CRI, Ra) is not less than 80 and fair compliance with the declared luminous flux.
R7s bulbs are designed to replace halogen bulbs in small spotlights. Ledroid has two types: 5 W 78 mm 500 lm and 9 W 118 mm 1000 lm. Lamps shine like halogen lamps 50 and 100 W respectively. For each type, there are two color temperature options of 3000K (warm light) and 6500K (cold light).
The luminous flux was measured using a
two-meter integrating sphere and a Instrument Systems spectrometer , the lighting angle and consumption characteristics of the Viso Light Spion instrument, the power consumption of the
Robiton PM-2 instrument, the color rendering index, color temperature and pulsation with the
Uprtek MK350D instrument . The minimum operating voltage, at which the luminous flux decreased by no more than 10% of the nominal, was measured using a
Lamptest-1 device, Stable Stab Instab
500 , LATP Suntek TDGC2-0.5 and an
Aneng AN8001 multimeter . Before measurements to stabilize the parameters of the lamp heated for half an hour.
The color rendering index of lamps exceeds the value of 83, the pulsation of light is practically absent, the luminous flux is as stated. Lamps can operate at a greatly reduced voltage, without reducing the brightness - five watts lamps work even at voltages of 71–73 V, nine watts at 95 V.
The lamp with the G9 base in Ledroid is still one - with a warm light of 3000K and a declared luminous flux of 320 lm (replacement of a 35 W halogen lamp).
Test results:
The color rendering index is 84, there is no ripple, the luminous flux exactly corresponds to the declared one. The lamp can operate with a voltage reduction of 98 V.
12-volt Ledroid lamps with a G4 base are available in three types: 2 W and 2.5 W on discrete 2835 LEDs and 2.5 W on COB LEDs.
These lamps are positioned as lamps operating at a constant voltage, while pulsation of light is excluded. In fact, these lamps can also operate on alternating voltage, and even tantalum capacitors of 100 microfarads of 20 V (marking 107D) are installed in them to reduce ripple when supplied with alternating voltage.
Test results:
Color indices are 83-87, the luminous flux of the lamps corresponds to the stated.
I repeat once again that when operating in a regular mode from a constant voltage source, there is no pulsation of light in all the lamps, and when powered from an alternating voltage, a 2-watt lamp has a pulsation level of 7-13% (this is not visible through the eyes), in a 2.5-watt lamp Lamp ripple level when powered by alternating voltage is 23-35% and such a ripple can be slightly visible. All lamps can reduce the supply voltage to 9.5-9.9 V.
All Ledroid LED bulbs have a color rendition index above 83, which allows us to recommend them for use in residential areas. For lamps with mains supply and 12-volt lamps when powered by constant voltage, there is no pulsation of light. All lamps can operate with a significant decrease in the supply voltage. The parameters of the lamps correspond to the stated. The manufacturer gives all the lamps a 1 year warranty.
© 2018, Alexey Nadyozhin