January 19, 2016 at 15:07Russian LED lamps Lisma
Saransk Electric Lamp Plant began production of LED lamps according to one of the most modern technologies - filament (LED filaments).
I got five lamps from different lots with a power of 6 and 8 watts. They must replace incandescent lamps of 60 and 75 watts.
For the manufacture of LED lamps, the same equipment is used on which ordinary bulbs are made. Even the stamp on the glass of the lamp is the same.
The bulb of the LED lamp is sealed, helium is pumped inside to improve heat removal from the threads. The threads themselves are purchased in China, the driver board is also made to order there, but the plant also plans to establish its own production of drivers.
On the driver board, located in the lamp base, a current stabilizer microcircuit, a transformer, capacitors, small strapping parts are installed. I photographed the driver board through the glass of the lamp.
And in this shot from the video about the production of Lism lamps, a board is visible on the reverse side.
Each LED strand has 26 blue LEDs coated with a common phosphor. Due to the fact that these LEDs do not work at maximum power, they do not heat up very much and give very high efficiency up to 96 Lm / W.
Unlike many other lamps on LED threads, each Lisma lamp thread has a metal strip that increases strength and improves heat dissipation. According to Thomson specialists, to whom I showed these bulbs, this is very cool.
For the 6-watt lamps that came to my test, the glass stand was fixed slightly crooked and the entire luminous part is skewed in the housing, but this does not affect the lamp operation in any way.
The packaging was apparently ordered in advance, so there are errors. On the boxes for 6- and 8-watt lamps, the luminous flux is 710 and 850 Lm, and in the instructions and on the manufacturer's website - 630 and 780 Lm.
I bought one 8-watt lamp for 250 rubles at the Interlight exhibition at the Lisma stand. Four lamps were provided to me by an online store selling these lamps in Moscow. Most likely, two pairs of lamps were from one batch, and my 8-watt lamp from another. I tested all five lamps.
Measurements were made using Viso LightSpion and Lupine instruments .
It can be seen that in the lamps from different lots different threads and different drivers were used. The driver provides a ripple of light of less than 4%. This is a great result.
The lamps work correctly with switches that have an indicator (do not flash and do not light when the switch is off).
The color temperature of the lamps is close to the declared and almost the same as that of incandescent lamps.
The lamps have a fairly high color rendering index CRI 82.4-82.7. This allows you to recommend them for use in residential premises. The color index table for one of the eight-watt lamps looks like this:
The luminous flux of the lamps is slightly lower than declared. For 6-watt lamps, it is 3-7% lower than declared, for 8-watt lamps it is 7-13%. A 6-watt lamp shines like a 60-watt incandescent lamp, and an 8-watt bulb does not reach a brightness of 75-watt and rather corresponds to a 70-watt lamp. I note that all the 8-watt lamps I tested on LED threads of all manufacturers gave a luminous flux at best, like a 70-watt incandescent lamp. And Lisma is no exception.
By identity, everything is very good. 6-watt lamps differ in luminous flux by only 4%, 8-watt from different parties by 7%.
Visually, the light of these lamps is practically indistinguishable from the light of incandescent lamps.
Photos were taken in manual exposure mode (3500K, ISO125, F1.8, 1/30).
The 6-watt Lisma in brightness corresponds to a transparent incandescent lamp of 60 watts.
I compared the 8-watt Lisma with a matte incandescent lamp of 75 watts.
Unlike a conventional LED lamp, the filaments do not blind and look exactly the same as the incandescent filament of a conventional lamp.
During operation, the lamps heat up rather weakly. The glass of a 6-watt lamp heats up to 41 degrees, the glass of an 8-watt lamp has a temperature of about 47 degrees, the hottest point is 55 degrees.
The manufacturer promises 30,000 hours of lamp life and gives a 2-year warranty.
I decided to put on a long-term experiment and turned on the 8-watt lamp in a sealed ceiling to create the most difficult conditions for it.
For a month, the lamp will work 720 hours. I will try to leave it turned on for 2-3 months and see how it behaves in such conditions after 1500-2000 hours of work.
The recommended retail price of a Lisma SDF-6W lamp is 280 rubles, SDF-8W is 360 rubles.
Today, Russian Lisma lamps are the best LED lamps of all that I have tested and one of the best LED lamps in terms of price / performance ratio.
All parameters of the tested lamps and Viso reports, including the spectra of the lamps, as well as all other results of my tests of LED lamps, see lamptest.ru .
© 2016, Alexey Nadezhin
I got five lamps from different lots with a power of 6 and 8 watts. They must replace incandescent lamps of 60 and 75 watts.
For the manufacture of LED lamps, the same equipment is used on which ordinary bulbs are made. Even the stamp on the glass of the lamp is the same.
The bulb of the LED lamp is sealed, helium is pumped inside to improve heat removal from the threads. The threads themselves are purchased in China, the driver board is also made to order there, but the plant also plans to establish its own production of drivers.
On the driver board, located in the lamp base, a current stabilizer microcircuit, a transformer, capacitors, small strapping parts are installed. I photographed the driver board through the glass of the lamp.
And in this shot from the video about the production of Lism lamps, a board is visible on the reverse side.
Each LED strand has 26 blue LEDs coated with a common phosphor. Due to the fact that these LEDs do not work at maximum power, they do not heat up very much and give very high efficiency up to 96 Lm / W.
Unlike many other lamps on LED threads, each Lisma lamp thread has a metal strip that increases strength and improves heat dissipation. According to Thomson specialists, to whom I showed these bulbs, this is very cool.
For the 6-watt lamps that came to my test, the glass stand was fixed slightly crooked and the entire luminous part is skewed in the housing, but this does not affect the lamp operation in any way.
The packaging was apparently ordered in advance, so there are errors. On the boxes for 6- and 8-watt lamps, the luminous flux is 710 and 850 Lm, and in the instructions and on the manufacturer's website - 630 and 780 Lm.
I bought one 8-watt lamp for 250 rubles at the Interlight exhibition at the Lisma stand. Four lamps were provided to me by an online store selling these lamps in Moscow. Most likely, two pairs of lamps were from one batch, and my 8-watt lamp from another. I tested all five lamps.
Measurements were made using Viso LightSpion and Lupine instruments .
It can be seen that in the lamps from different lots different threads and different drivers were used. The driver provides a ripple of light of less than 4%. This is a great result.
The lamps work correctly with switches that have an indicator (do not flash and do not light when the switch is off).
The color temperature of the lamps is close to the declared and almost the same as that of incandescent lamps.
The lamps have a fairly high color rendering index CRI 82.4-82.7. This allows you to recommend them for use in residential premises. The color index table for one of the eight-watt lamps looks like this:
The luminous flux of the lamps is slightly lower than declared. For 6-watt lamps, it is 3-7% lower than declared, for 8-watt lamps it is 7-13%. A 6-watt lamp shines like a 60-watt incandescent lamp, and an 8-watt bulb does not reach a brightness of 75-watt and rather corresponds to a 70-watt lamp. I note that all the 8-watt lamps I tested on LED threads of all manufacturers gave a luminous flux at best, like a 70-watt incandescent lamp. And Lisma is no exception.
By identity, everything is very good. 6-watt lamps differ in luminous flux by only 4%, 8-watt from different parties by 7%.
Visually, the light of these lamps is practically indistinguishable from the light of incandescent lamps.
Photos were taken in manual exposure mode (3500K, ISO125, F1.8, 1/30).
The 6-watt Lisma in brightness corresponds to a transparent incandescent lamp of 60 watts.
I compared the 8-watt Lisma with a matte incandescent lamp of 75 watts.
Unlike a conventional LED lamp, the filaments do not blind and look exactly the same as the incandescent filament of a conventional lamp.
During operation, the lamps heat up rather weakly. The glass of a 6-watt lamp heats up to 41 degrees, the glass of an 8-watt lamp has a temperature of about 47 degrees, the hottest point is 55 degrees.
The manufacturer promises 30,000 hours of lamp life and gives a 2-year warranty.
I decided to put on a long-term experiment and turned on the 8-watt lamp in a sealed ceiling to create the most difficult conditions for it.
For a month, the lamp will work 720 hours. I will try to leave it turned on for 2-3 months and see how it behaves in such conditions after 1500-2000 hours of work.
The recommended retail price of a Lisma SDF-6W lamp is 280 rubles, SDF-8W is 360 rubles.
Today, Russian Lisma lamps are the best LED lamps of all that I have tested and one of the best LED lamps in terms of price / performance ratio.
All parameters of the tested lamps and Viso reports, including the spectra of the lamps, as well as all other results of my tests of LED lamps, see lamptest.ru .
© 2016, Alexey Nadezhin