After a short while defective - 4 watts even when light from

After a short while defective - 4 watts even when light from

reer 5060 - LED Night Light (household goods)

Customer Review

I have bought 2 of these night lights for my daughter. The first time they ran without problems - bright enough light in my opinion - light sensor switches in the dark one the LEDs.

Approximately 1 month was the first break - after a power reinserting (socket).
The 2nd held two months longer. Then again, like the first, it gave up the ghost.

Since I have professionally much to do with electronics, I have the parts summarily disassembled and looked at the inner workings of exactly measured a bit and was a bit shocked.
I had really expected any miracles on circuit technology, but that was really too much.

Point 1)

How to read in some (Niedrigstern-) Reviews consumed the part in about 5 watts, regardless of whether the light is on or not.
My measurements have shown that when switched LEDs (Incidentally, there are three piece, it could be fitted 5 but) the current consumption is lower than when the LEDs are turned off.
This may sound contradictory at first glance, a glance in the custom built diagram explains but very quickly why:

Essentially it is a very simple power supply capacitor (not uncommon for such applications), after all, with a 4-way rectification (there are therefore used at half-waves). The LEDs are always connected to the low voltage and then pull about 9 mA.
When light falls on the sensor, this voltage via a transistor and a 82 Ohm resistor is virtually short-circuited. It then flow approximately 18mA and the voltage at the LEDs collapses to about 2 volts. Since 3 LEDs are connected in series is no longer enough these voltage of bringing order to the LEDs "to shine". If no (or little) light falls on the sensor reaches the voltage to the LEDs to drive, in my experiments but flowed still a residual current of approx 5mA through the transistor - Therefore, the total power consumption at 14mA LEDs lit approx.
If you add the two current values ​​to the mains voltage (approximately 230 volts RMS) we arrive at the switched LEDs to approximately 3.2 watts, in off LEDs grew to 4.2 watts.

Simply put:
- Glow in the dark, the LEDs because they is enough energy available
- In the light, the voltage is short-circuited - thus the LEDs do not (and the power consumption is even higher).
- Let miteinfließen a bit more brains into circuit design - then the part might be better than sending

Point 2)
Again, in the low-star rating is often reported that the night lights by (more or less) short time give up the ghost. This is precisely what has happened also in mine.

It has been found that R1 was blown (and that should really not happen)

In a capacitor power supply sits in first place in front of the condenser normally a resistor limits the charge / discharge current of the capacitor. I know here sizes of about 100 ohms. Depending on the power-supply capacity of the power supply are the power resistors (partly more about the power split) in the range of 1/2 - 5 watts.
Here comes a 1-ohm resistor, 1/8 Watt used (said R1).
If you will be (worst case) the nightlight when discharged capacitor at 90 ° (ie, in the apex of the sine wave voltage) plugged lie in the resistance (still a Ohm) about 312 volts. P = U² / R - so really a lot (at least for a short time). This could well be the reason that the resistance when inserted just "burns away".

Simply put:
In my opinion, the resistance is too small (both Watt and on ohms). Therefore, he can break into the outlet when plugging in the night light.

In summary:
- Light well
- Who it trusts itself: if the part is broken: Screw and R1 exchange (I used 220 Ohm - because I just had nothing else there)

... But please caution: High voltage, danger to life! An incorrect resistance fire hazard!

- Power Consumption when switched off much too high - shame really.

Thus 3 stars (when functioning - and does not burn my hut with the repaired parts ...)
2 star deduction because the (for the same price) definitely could have done better.

Lebanese poet Rank: 5/5
April 4
Very good product in 2707 Rank: 5/5
March 8
166 low quality Rank: 2/5
December 21
Stable & good handling! Rank: 5/5
January 13

Related Reviews


After a short while defective (2 times consecutively)ESPRIT men's wristwatch XL Analog automatic ES101311705 (clock) After a short while defective 2kwmobile® Elegant and lightweight 2-Part Crystal Case for Apple MacBook Air 11 '' in Transparent (Electronics) Thermometer after a short time defect - complaint remained unanswered !!!!Baby bottle thermometer 24 cm analog. Baby bottles / food thermometer glass with wooden ball (household goods) after a short period defective BUT!mumbi Car charger Samsung Galaxy S5 / S4 + S4 mini / S3 + S3 mini car charger (Wireless Phone Accessory) After a short time defect 1Qualitaets Funkfernausloeser Canon 1100D, 1000D, 600D, 550D, 500D, 450D, 400D, 350D, 300D, 60D, 300, 50, 33, 30, PowerShot G10, G11, G12 (electronic) After a short time defectivemumbi Mini Car USB Adapter DUAL - 2 USB ports with up to 2.1A Output 2100mA for iPhone iPad iPod HTC Desire LG P990 Samsung i9100 among others USB devices (accessories) after a short period defective / no audioCable direct Mini DisplayPort> HDMI adapter cable (Full HD 1080p 3D) - TOP Series (Accessories) Unfortunately, after a short use defective!SP POV POLE 36 "(92cm) LARGE telescopic rod for GoPro (Electronics) After a short time defectSharp Electronics R242BKW microwave (Misc.) Battery Battery defective after a short timevhbw Ni-MH battery 60mAh (2.4V) for Headset Sennheiser A200, HDI 302 HDI 380, HDR4, HDR6, HDR30 as BA-150, BA150, BA-151, BA151. (Electronics) Fusslig and full of holes after a short timeMaternity Leggings waist-Panel Cotton Leggings Maternity Long for pregnant SML XL XXL 3XL 36 38 40 42 44 46 LCP (textiles) BB defective after a short time + overall poor qualityKettler 8174-400 - Super Trike (Toys) Defective 4 of 4 after a short timeSEBSON® GU5.3 MR16 LED lamp 3W 220lm (Replaces 25W) [Warm White - SMD LED bulbs - 110 ° viewing angle] (household goods) Defect after a short period of useClarisonic Mia 2 Sonic Skin Cleansing System - White (Personal Care) Defective After a short time2x Bundle Star * Patona PREMIUM Battery for Canon NB-6L (real 1000mAh !!) for Canon Powershot SX170 SX240 SX260 SX270 SX280 D30 SX500 SX510 SX520 SX530 SX600 SX610 SX700 SX710 S95 S100 S120 S200 (Electronics) After a short time already defective3 meters LED Light Up Braided cloth Micro-USB cable - extra long 3m Universal charger with flat tangle free Noodle Ribbon-style knit coat, blue LED light head charger for Android / Windows smartphones and tablets (Samsung, Motorola, Microsoft, Nokia, HTC, Droid, Blackberry, Asus, Google, Acer, HP, Galaxy) (Personal Computers) Defective adapter after a short timeApple Lightning to Micro USB Adapter (Electronics) defective tip switch after a short timeBattery K1 Leo von Hannets® with 1100 mAh for e-cigarette (Personal Care)