Posts tagged Replaced

Question by Marçal: Replaced halogen by LED, how to prevent transformer shutdown? Hi, I replaced two 12V 20W halogen bulbs (wired in parallel) by two 3W 12V LEDs also in parallel. The problem is that the transformer (in a kitchen fume hood) seems to shut down when both LEDs are connect. It can take one but the two cause problems. I guess this might be caused by the very low resistances of the the 2 LEDs connected in parallel that short circuit the transformer?… How can I reduce this “short circuit” without causing significant voltage drop for the LEDs? I tried using them in series but they will not work because they will then each have half the required voltage. Of course the idea is o find a solution that will also not significantly interfere with the energy savings associated with the change of halogen by LED. Btw, the LEDs are MR16 and have their own tiny voltage regulator/stabilizer circuit (or whatever that is).

Thanks! Hi, the individual LEDs are not 12V but the MR16 bulb (each containing 3 LED chips) is rated for 12V AC or DC. It has, as I mentioned, it’s own voltage regulator built in. The spots work well with one or two halogen lamps or just one LED (either one, so they both work fine). When both are connected then all blinks briefly and goes black.

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Hi, I replaced two 12V 20W halogen bulbs (wired in parallel) by two 3W 12V LEDs also in parallel. The problem is that the transformer (in a kitchen fume hood) seems to shut down when both LEDs are connect. It can take one but the two cause problems. I guess this might be caused by the very low resistances of the the 2 LEDs connected in parallel that short circuit the transformer?… How can I reduce this “short circuit” without causing significant voltage drop for the LEDs? I tried using them in series but they will not work because they will then each have half the required voltage. Of course the idea is o find a solution that will also not significantly interfere with the energy savings associated with the change of halogen by LED. Btw, the LEDs are MR16 and have their own tiny voltage regulator/stabilizer circuit (or whatever that is).

Thanks! Hi, the individual LEDs are not 12V but the MR16 bulb (each containing 3 LED chips) is rated for 12V AC or DC. It has, as I mentioned, it’s own voltage regulator built in. The spots work well with one or two halogen lamps or just one LED (either one, so they both work fine). When both are connected then all blinks briefly and goes black.

Read More >>