Recent comments in /f/DIY

Riegel_Haribo t1_j2o3132 wrote

Maybe YOU should consider solid-state SCR dimmers were in use since 1961: https://www.architectmagazine.com/technology/lighting/the-solid-state-electronic-dimmer_o

edit: amazing how many button-pushers don't realize the the nonsense they are upvoting above. Dimming lighting with a variable resistor in a utility box would be a ridiculous hazard. At particular setting you can have made a voltage divider with as much power dissipation in the box as from the total of incandescent light fixtures.

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FerretChrist t1_j2o25qa wrote

I have Philips Hue bulbs throughout the house. The app is pretty decent when you want to dive in and edit colours and scenes, but I couldn't live using it day to day just to turn on and off the lights, that would be insanity.

I've attached "Hue Wireless Dimmer" controls next to every light switch. They turn the lights on and off, cycle through different scenes, or turn up/down the brightness. Best of all, they attach magnetically, so you can pull them off the wall and control the lights while you're sat down.

The only downside (except the price!) is they're battery powered, but I've had them in for two years now and not needed to change a battery yet.

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Tack122 t1_j2o0yr2 wrote

I use that with my dimmers, but what I'd also like is to regrade the scale.

I use the app on my phone and have my lights set to minimum 20% on the low end trim thing, but I only really get dimming between say 50% and 20%, and the low 20%s are nice for night time, low light.

But it's fiddly when the bar has 20-100% on it, and you're only trying to use a tiny section of it.

I wish I could increase the size of each setting from 20-30 relative to the size of 70%-100%. 70% to 100% looks about the same without a light meter so the difference is relatively unimportant.

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coyote_of_the_month t1_j2o07jh wrote

When we bought our house last year, it was yellow-biege, including ceilings, and was mostly lit with honest to God incandescent bulbs.

We painted it a cool off-white and went overboard with 5000K daylight bulbs, if I'm being honest. It made such a difference! Our close friends haven't been shy about saying they hate it though, and I'm coming around to maybe buying some 3000K bulbs as the memories of the beige start to fade.

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argon561 t1_j2nzb61 wrote

It's correct that the inrush current is the MAIN problem with LED lighting.. Though it should be noted that most dimmers now actually circumvents this problem by trickle charging the LED-driver capacitors, and by doing this, can absolutely handle the continuous wattage specification.

It's quite easy to check if you have such a dimmer (or LED-driver for that matter).

Turn the lights off. Let them stay off a couple of seconds.

Turn them on. If they don't respond IMMEDEATELY when the button on the dimmer is clicked (like they do when shut off), the dimmer is "trickle charging" the capacitors with it's own circuitry. When the inrush current goes below a threshold that is acceptable, the lights will turn on and "full power" is fed to the lights.

This can also be noticed if a LED "gradually gets bright", and not "direct full brightness" when it's switched on.

If it's a very old control device / dimmer, it might not have this feature, and on those, you'd be best of by dividing it's rating by at least 10.

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Raul_McCai t1_j2nwygi wrote

I am assuming this is a 120 VAC line and the bulbs have a circuit in them that conditions the electricity to the LED's needs.

So - - Probably a hell of a lot of them. What's the Forward voltage of the LEDs?

The Kelven is irrelevant. In fact all those other numbers are irrelevant.
One thing I've learned dimming LEDS is that you need (at least you used to) a conventional load on a conventional dimmer. It can be a s little as a 15 Watt bulb but the dimmers need to see a regular load od they won't shut down and will flicker. I haven't had any experience with the newer dimmers that are made for just LED loads. Leutron makes some

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georgecm12 t1_j2nvstx wrote

>Is anyone considering that OP has a problem with CO2, as posted?

Not really, because CO2 detectors are generally not a thing. They exist, but are very much a specialty industrial device used where there is a lot of carbon dioxide in use. (For example, a storage room in a restaurant that contains carbon dioxide tanks for use with soda fountains.)

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kittenrice t1_j2nvjr1 wrote

CO alarms are commonly installed in homes, CO2 alarms are not.

CO2 is a common misspelling of CO. So common that google just assumes you're an idiot and gives you results for CO alarms.

OP has a CO problem. Possibly a cracked heat exchanger, if they have a forced air furnace. Or a bad flue pipe, or negative pressure pulling exhaust back inside the home.

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LateralThinkerer t1_j2nu5u0 wrote

3000K - 4000K FTW depending on where you're using it. Work areas you might actually like the "harder" 4000K or more but for interior domestic areas the lower color temperature is best. Also don't be afraid to actually check out lit bulbs in a big-box store if you can...manufacturers will fudge their color temperatures sometimes though this becoming is less common. Source: Light nerd who's refitting his house away from fluorescents.

Here's a graphic guide

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theidleidol t1_j2nt61p wrote

I don’t think they’re confused by the “100W equivalent” part. They’re asking about the limits marked on the switch. The reason it lists both is that the dimmer is genuinely rated for a smaller LED load than it’s rated for an incandescent load. But then they also looked it up and found the rough formula for calculating that derating yourself (in the event it’s an older switch or whatever that hasn’t already done the LED math for you) and got confused.

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Mr-Thumpasaurus t1_j2nshgq wrote

Valid points, just wanted to note, the Philips Warm Glow bulbs I mentioned are not smart bulbs, they're dumb bulbs that dim in a kinda smart way

https://www.usa.lighting.philips.com/consumer/choose-a-bulb/warm-glow-dimmable-led-lighting

You still need a physical dimmer etc, you can dim them as your evening progresses to help cut out the blue light

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NCaliZen t1_j2nscst wrote

The issue with LED fixtures is that they can have a significant amount of inrush - current that comes through the device when it is initially turned on. That inrush can destroy your control device.

(Note: This isn’t the first time something like this happened in the industry. When the industry moved from magnetic ballasts to electronic ballasts for fluorescent lamps, the new ballasts had a significantly higher inrush. A side effect was some manufacturer’s wall switch devices couldn’t handle the inrush and would be destroyed. The National Electrical Manufacturer’s Association (NEMA) worked on a standard to define an acceptable amount of inrush, but by the time the NEMA 410 inrush standard was developed, electronic ballast manufacturers had mostly redesigned their product to reduce inrush. History just repeated itself with the introduction of LED lighting.)

If you had a dimmer that didn’t call out a LED rating, the safest thing to do would be to divide it’s rating by 10, so a 600W dimmer shouldn’t control more than 60W of LEDs.

However, since the dimmer you have calls out a 150W LED rating, you should be fine loading it with - in your given example - 84W.

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