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We've recently had some dimmable spotlights installed in our dining room. We have a setup where we have 3 lights off one switch, and 6 on a second switch. The lights were not dimming very much, maybe to about 50%. We assumed it was usual for spots like this and we weren't too worried about the range.

Lately we noticed that one bulb on the 3 light circuit was blinking intermittently (it's generally set to the lowest brightness setting) I thought that to see if it was the bulb or not I'd swap the bulb with another on the same circuit.

Here's the funny thing. When I did this, the dimming range of the 3 lights has improved dramatically, going all the way from barely visible in the day time at it's lowest to full brightness at it's highest?!

Why has this happenned?

I am now in the situation where one half of the room dims to about 50%(the 6 light circuit) and the other all the way to 1%(the 3 light circuit). I want to get the other circuit dimming in the same way, but not sure what to change!

Very confused !!

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  • Are these incandescents? If not what are the make/models of the various light bulbs? – Harper Jun 20 at 17:59
  • Hi Harper, they're all the same make/model Led spotlights, Led and Gu10 220-240v 50hz. I'll add a picture of the box! – Andrew Humphries Jun 20 at 18:17
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    I took the liberty of rotating your picture, and adding double carriage returns between each paragraph so they render properly in this platform's markup. – Harper Jun 20 at 18:55
  • It sounds like it may be a difference in the dimmers. They're not all the same (unless they are :)) It's certainly not an overload problem, not at 5 watts/bulb. – Harper Jun 20 at 18:57
  • it's mostly the dimmer. a better/newer one should give you a better range. Specifically, it relates to the holding current of the triac, and it being too high. The last bulb you swapped draws more current than the one it replaced, so the triac can stay on longer before there's not enough current to pin the gate open, and that makes the other bulbs nice and dim. – dandavis Jun 20 at 19:00

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