Add water, add freeze-thaw cycles, and perhaps a manufacturing flaw on one bulb, water gets where it should not, things don't work so well. Remember, LED lights are polarized. Light is produced because electrons are energized when electricity is introduced to the diodes. Water intrusion - LED "bulbs" are typically complex assemblies with joints, as opposed to the glass envelope of an incandescent floodlight. The bulbs and dimmer worked for a little while, but then the bulbs stayed dim when the dimmer was bright up to full brightness. It is important to understand how this happens. Generally, a short circuit in a single fixture leads to a single light or group of lights not working. Fluorescent Light Fixture Question: Why is our fluorescent light fixture dim? The fist step is to find the LED that is no longer working. First thing to do is check the light to see if it is good. All LEDs are sensitive to the temperature of the surrounding environment, so endless days in triple-digit heat will cut your lights’ lifespan short. It’s also why they don’t overheat and last so much longer than traditional bulbs. Why are my car's headlights not bright enough? The white LED bulb is a special case: The white light produced by a white LED is fluorescent light, at least in part. So why are my LED lights not working? LED light is too bright. LED technology has established itself and LED lights have many advantages. The major offender is moisture. I checked the lights and all the bulbs seem to be lit up properly. Riddle me that one lol They are both operated by the same switch. Lights should be IP65 rated or higher if you want to put them outside. At first, only one bulb dimmed out, then a day or so later the other went. If it does not light, reverse the leads and try again. If not discard the light. The bulbs are fluorescent. I brought an LED compatible dimmer and changed out the switch for the dimmer. Found the problem one, but changing the bulb didn't work… My husband put the bulb in backwards by accident and now the whole strand is bright! My kitchen lights have dimmed down to the point where we can barely see that there’s electricity even getting to them. Typically, bright yellow fluorescent phosphors are activated by a high-efficiency blue LED, and the result includes yellow (with some orange and red) as well as the original blue. We have led lights half the strand dim and half bright. But sometimes an annoying effect occurs: Light-emitting diodes radiate their light almost point-shaped. I have a chandelier with five lamps. I brought five dimable LED bulbs. LED lights are on dimmers: If you have the LED bulbs on a dimmer switch, you will notice the dimming and flickering MORE if the LED lights are slightly dimmed when surge wattage happens. Simple component failure is the other likely option. The non working LED will obviously be in the string half that is not working. If it lights good. So using a "light fixer" for the original mini lights, remove the bulb from the socket and touch the leads to the light tester. Many LED strip lights are not intended for outdoor use. As a result, many people perceive the light as much too bright. It's like the bulb now remembers only the dimmed setting. This will go far in helping you buy an adequately bright bulb in the first place. The Reason LED Lights Dim LED Lights operate through semiconductors and they do not get to the touch, or melt the plastic bulbs they are often placed in, a small amount of heat is released. Dimmable LED light bulb. For example, when your central air conditioner clicks on, you will notice the LED lights dim or flicker slightly because of surge wattage. 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