I found another good option for the simplest conversion into an "eternal light bulb". These are Lexman 10 W 1000 lm lamps, sold for 85 rubles in Leroy Merlin stores.
For those who haven't read my previous posts, cheap LED light bulbs fail quickly due to overheating of the components. If you reduce the power, the heating will decrease and the light bulb will become almost eternal. For some lamp models, to reduce power, it is enough to remove one resistor on the board under the diffuser cap. It makes sense to remake lamps with good LEDs and a switching (IC) driver.
I recently talked about the new Lexman lamps (https://ammo1.livejournal.com/1298503.html), of which lamps are best suited for rework 10 W 1000 lm.
To remove the cap, first we heat the joint of the cap and the body with a hairdryer in the maximum temperature mode for a minute, then tear off the cap with force.
LEDs and all driver components for these lamps are soldered on one board (DOB - Driver On Board).
The driver is based on the BP2863 chip.
The current-setting resistors are connected in parallel, their resistance is 3.3 ohms (RS1) and 7.5 ohms (RS2). Our task is to remove the resistor RS2.
Unscrew RS2 with a screwdriver, being careful not to damage RS1.
That's all. We close the cap - the light bulb has become eternal.
I compared the temperatures on the lamp cases and boards before and after the rework. Before measurement, the lamps were operated for 40 minutes with the hood closed. The cap was removed immediately before the temperature measurement.
Before the conversion, the lamp body was heated up to 67°C, the board up to 80°C. After the rework, the temperature of the case dropped to 53°C, the board to 63°C.
The power of the lamps has decreased from 10 watts to 7 watts. The luminous flux has decreased from 1000-1050 lm to 780-790 lm. Efficiency increased from 102-106 lm/W to 113 lm/W. The converted lamp is a complete replacement for the 75W incandescent lamp.
The color parameters remained practically unchanged: CRI (Ra) 82-83, color temperature 2750K and 4050K.
I modified bulbs with release date 0421 (code 1R060421 on the body) and 0921 (code 1R150921). For lamps from other batches, the board and resistor values \u200b\u200bmay differ.
If it seems to you that everything is done wrong, the resistor must be soldered, and not broken off, the remaining resistor will overheat or you have other similar questions, I advise you to read my article "Making an eternal light bulb: questions and answers" (https://ammo1.livejournal.com/1229877.html). :)
My previous articles about eternal light bulbs: "Making an eternal light bulb" (https://ammo1.livejournal.com/1229049.html), "Making the light bulb eternal and super efficient" (https://ammo1.livejournal.com/1255794.html).
© 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#eternal light bulb#LED lamp#lamp test#do it yourself