LED light bulbs. Practice

Introduction

Like many people, I quite liked the post about the internal structure of LED light bulbs . The only thing missing was seeing how it all shines in life. Over the past six months, a dozen Chinese LED bulbs have accumulated and some experience that I want to share.

Update 02/11 23:00 - New test, new light bulbs.

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Light bulbs

A pair of LED bulbs was chosen as a replacement for the usual 60W (different in price and quality). For comparison, I took a couple of ordinary and fluorescent light bulbs:



1) Normal 60W Philips (720Lm / 2700K)
2) Normal 40W Philips (415Lm / 2700K)
3) Fluorescent coil in a 13W Navigator ball (780 Lm / 2700K)
4) Fluorescent Spiral 15W Shine (900Lm / 2700K)
5) LED 9W China (cheap) (declared 800 Lm / 3000K, turned out to be dimmer and more than 5000K)
6) LED 7W China (expensive) (declared 630Lm / 3015K, subjectively corresponds)

Test

- Room 3x4 meters.
- The lamp is approximately in the center at a height of about 70 cm from the floor.
- Shutter speed, aperture, ISO, white balance of the camera are fixed.



The same, but the image was converted from RGB to HLS and taken L (light layer). The numbers indicate the brightness of identical points in the photographs:

results

Of course, modern fluorescent is quite a worthy alternative:
+ compact;
+ mercury in a safer “non-liquid” form - non-evaporating amalgam up to 60 degrees;
+ reasonable price (about 150 rubles);
- there are minuses, but they are few (they turn on for 30-40 seconds, there may be flickering, it is difficult to utilize).

But LEDs are not so bad and can be a worthy replacement for ordinary and fluorescent lamps, especially those that are more expensive:
+ percent is 30% more economical than luminescent in electricity consumption;
+ turn on immediately;
+ no flicker;
+ no mercury;
+ “warm color” lamps are very close to ordinary incandescent lamps;
- scattering angle of 180 degrees (subjectively, there is a small difference, but quite a bit, and in the ceiling lights it will not be at all);
- price (about 550 rubles for a good lamp with delivery).

About China

If, nevertheless, decide to order an LED lamp in China, it is better not to chase the price to the last, especially if you are not sure of the manufacturer.

Now the margin of the Chinese manufacturing plant with 5-9W e27 bulbs 2-4 $ . And this is a margin - with which you still have to pay salaries, maintain the building and equipment, incur marketing expenses. Therefore, if you see the price is much lower than the rest, then this is a “cat in a bag” and to a greater extent - there they either embrace it with characteristics, or even very unreliable components and quality and appearance limp.

Update
Some video internals:
General view, build quality, and the LEDs themselves:



Update 02/11 23:00
Video with 6 light bulbs: for ease of comparison, the video is duplicated - choose the time on the rollers in accordance with the light bulbs

1) 00:00 - 00:23 // 60W Philips incandescent lamp (700Lm / 2700K)
2) 00:24 - 00:48 // 7W LED LongSun (600Lm / 3050K)
3) 00:49 - 01:12 // 8W LED Century (520 Lm / 2500K)
4) 01:13 - 01:38 // 75W Philips incandescent lamp (900Lm / 2700K)
5) 01:39 - 02:02 // 15W fluorescent Shine (900Lm / 2700K)
6) 02:03 - 02:30 // 9W LED LongSun (800Lm / 3050K)