General > General Technical Chat
UK to attempt to ban the sale of halogen bulbs.
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themadhippy:

--- Quote ---The supply here is 245-250V+
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--- Quote ---Have you spoken to whoever runs your local electricity grid?
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Why would they care ,250v is still within spec by a full 3 volts


--- Quote ---I do have some that will dim some LED bulbs down to a very dim glow rather than snapping off. They are dimmers that were originally meant for dimmable CFL and have a pot behind the faceplate that you can use to set the bottom end to avoid having a dead band where the lamps just go out.
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But at the end of the range theirs still a visable snap from light to dark when compared to incandescent,the only successful way ive seen of achieving a nice fade to black with leds involved mechanical shutters
james_s:

--- Quote from: themadhippy on June 12, 2021, 06:56:45 pm ---But at the end of the range theirs still a visable snap from light to dark when compared to incandescent,the only successful way ive seen of achieving a nice fade to black with leds involved mechanical shutters

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They go down dim enough that they are not producing any useful light by that point anyway, the snap to off is not noticeable at all, you'd almost never turn the light down that low on purpose. It looks quite a bit brighter in the picture than it does standing there because the room is on the back side of the house shaded by trees so it's quite dark in there right now. At night this setting is pretty close to the amount of light from a single candle.

I have some other lamps made by Cree that are in one of the bathrooms, they are not on a dimmer but turning them off they produce a noticeable fade, probably 200ms from full brightness all the way down to off. I haven't tried one on a dimmer but I suspect it would behave similarly.
paulca:
You can buy self dimming bulbs, they are just a smart bulb with bluetooth and a dimmer thing that clips over your light socket with buttons/knob.

I have a few "transient rooms" like hallways, bathrooms with motion sensed lights.  They are set to 50% brightness except between midnight and 6am when they are 25%.  Works a treat.  Even in a bathroom or hallway, you don't need the bulb on 100% brightness, if you do, you probably need a bigger lamp.
themadhippy:

--- Quote ---They go down dim enough that they are not producing any useful light by that point anyway, the snap to off is not noticeable at all, you'd almost never turn the light down that low on purpose
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Maybe not in a domestic environment,but in a theater it  can be  very noticeable.
james_s:

--- Quote from: themadhippy on June 12, 2021, 10:27:42 pm ---Maybe not in a domestic environment,but in a theater it  can be  very noticeable.

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I had assumed we were talking about a domestic environment. A theater is somewhat more specialized and may need a more specialized solution. It's certainly possible to dim LEDs smoothly all the way down to zero, there are technical issues doing so with a triac dimmer meant for incandescent lamps. I have some that will go down even lower than those Philips lamps on a trailing edge dimmer though.
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