Have this nightlight bought so is not always turned on the main light in the corridor with us. Therefore, the night light as possible should be a little lighter, and have the reviews promised here on Amazon. As it happened, I was disappointed in this news first about the color of light. For a night light you want but a warm light color, but there are cold-white LEDs inside. Well, maybe a matter of taste. The next step then I was disappointed the brightness of the NL-4. I have certainly expected more - and soon found out as I get more: hold your finger on the photocell! Here the lamp lit so their own photo sensor such that it is comes into action. Then I noticed that there is no defined switch-on and switch-off. The lamp dims slowly with increasing ambient brightness, starting even at very low light conditions. I quickly realized that someone has given very little trouble with the electronics. So screwed: Tri-Wing screw set as a first hurdle and if you have the out, we continue with the glued lampshade. Unfortunately, the lamp can not be opened without damage, but I'll get it on. The processing of the printed circuit board (especially the soldering quality of wired components) is not great. However, since the number of components is very low, very few end users will experience failures. The diagram is very simple and therefore recorded quickly. I put it with the product photos. From the diagram it soon becomes clear that this is simply the LEDs are shorted together in bright surroundings. The current flows through the transistor past the LEDs and, depending on the brightness of the transistor burned, more or less a lot of power. But current always flows. So the brightness sensor has only the function of the LEDs to protect against premature wear - or to suggest to the customer that there would not flow. The dimensioning of the circuit is such that even in very low light, the light is dimmed. That led me to the fact that the maximum brightness can not be achieved in normal operation but only with fingers on the photocell. Recommendation: The 150K resistor switch a 10K parallel. Just because you can not open the harmless NL-4, is a really just something to stick by the photocell so that they would collect less brightness. They can also be totally seal, but then you would better the cheaper NL-2 (without photocell, but with switch) bought. Or just accept the fact that it lights up only moderately bright. Me as an electronics does this product hurt the heart. No 50ct more, and it would be a reasonable Daemmerungsschalter with hysteresis and LEDs in warm white have been possible. And now, the partial modification is possible not even opening harmless, so pointless. Such a pity.
