Most LED flashlights come with an o-ring already on both the tail and head of the flashlight as you can see in the image above with the Klarus XT2C body. Halogen bulbs are not affected by polarity therefore some car manufacturer may have their polarity reversed. Some of them don't last 10 months. As I mentioned earlier the removal of a light will increase the current and LED's do not like high current. Before you replace the existing bulb, give it a twist and a jiggle -- sometimes that works. If your HID kit or LED kit still doesn't light up after reversing the polarity, your headlight fuse might be too weak. Anatomy of an LED strip. With the faulty LED light removed the light string half that did not work is now working minus 1 light. You start thinking things like “These were supposed to last forever,” and “Are LED lights really worth it?” They are, and they can be fixed. Some people also swap the ends so that the pocket clip is in the direction they want it. Before you give up on them and switch back to incandescent Christmas lights again, take a moment to think about the good side of LED lights. Keep in mind that using a 24VDC power supply with a 12VDC LED Light will not make it twice as bright, and vice versa, doing so will cause damage to the LED products and is a serious fire hazard. My HID Bi-Xenon high beams or low beams are not working or are inverted. An LED strip light is typically half an inch (10-12 mm) in width, and up to 16 feet (5 meters) or more in length. 3. Socket tab I measure the current in the light string half that was not faulty and it was 9mA. That's often when we notice problems. After hours of decorating, you finally plug in your LED Christmas lights, and nothing happens. Otherwise, try a new one. However, many flashlights won't turn on if there are two or more o-rings at the head or tail. 4. However, LEDs work differently to old-style light bulbs, and this can cause some issues when fitting them into older circuits. Some flashlights, like the Armytek Viking Pro, come with two o-rings on the head. Never use 2 power supplies on one LED Light or LED Light Controller. They can be cut to specific lengths using just a pair of scissors along the cutlines, located every 1-2 inches. https://blog.1000bulbs.com/home/troubleshooting-led-strip-lights 2. For example, PD35, UC35, PD32, etc. If replacing any bad bulbs and fuses hasn’t solved your problem, you likely have an issue with a bad shunt (in incandescent lights) or bad wiring. If you ever take your flashlight apart to clean it and you get the tailcap and the head reversed, your light won't come on. And if the old one is a CFL (compact fluorescent), don't spend much time thinking, "It can't be the bulb; they're supposed to last 10 years." Old fashioned incandescent bulbs won't light up if there's only a small amount of electricity running through them, so you would never notice this current, but LEDs are much more efficient and apparently are getting enough power to run. The tip of a pen may come in handy to help push the fuse in place. Slide the cover back over the compartment, then plug in the string and see if all the lights work. Upping the fuse by 5 amps might do the trick. It takes a very specific fixture to be able to dim to your desire. Light bulb. On this page we look at some of the most common issues experienced when switching to LED bulbs - such as LED lights flickering, buzzing or not dimming properly - and how to resolve them. New LED fixtures can be so bright and efficient, you have to take the lights down very low on the dimmer in order to get them to the right level. Light Won't Come On This applies to all the lights which have a removable head and tailcap. 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