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56 votes

LED Light bulbs burning out much sooner than expected

Yup, that's marketing. And then, these bulbs don't last long, either. They work fine for about 3 months, but then they start randomly getting dim for a minute or two, then getting bright again for a ...
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39 votes

Can I safely use a 9w LED bulb in place of a 40w incandescent?

Yes. The fixture is concerned with heat. Your LED light bulb makes about 9 watts of heat. Your fixture is rated for a bulb that makes 40 watts of heat. With an incandescent bulb, 98-99% of its ...
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35 votes
Accepted

Why do my led bulbs state: not for use in totally enclosed luminaires?

Yes, it is because of the heat buildup in enclosed fixtures, and no you should not use the bulb in that ceiling fixture you listed unless you are willing to accept shortened bulb life. Your options ...
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  • 13.7k
35 votes

Is is safe to use LED strips that shine onto stair risers instead of directly onto treads?

I really like the way your mock-up looks! Additionally, as one whose eyes are extra sensitive to bright light, I would significantly prefer that to having any chance of light shining directly into my ...
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  • 29k
29 votes
Accepted

Why won't a LED bulb work in a standard light fixture?

I found the answer! @diceless set me on the right track in looking at where the foot of the bulb is connecting to the fixture. Since it was an older fixture (installed in the 80's, I think), the hot ...
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  • 589
29 votes

Is it safe to put a 120W equivalent LED bulb in a 100W max fixture?

Yes, that is fine "like" /"equivalent", etc. are based on light output. Limitations on fixtures is based on heat output. Some power (Watts) becomes light, the rest becomes heat. ...
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29 votes

Is an extra 1 W that significant with LED bulbs?

There are two completely different thermal objectives First, don't set other stuff on fire. That's decided by the thermal insulation of the fixture (think: thick insulation in down lights) and limits ...
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28 votes

Lutron LED/CFL Dimmer switch turns lights off the wrong way, up is down and down is up. What's the problem?

You've probably connected one of the 2 power wires to the incorrect traveler terminal on the switch. This switch can be used as both a standard two-way switch as well as a three-way switch. (A three-...
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  • 550
21 votes

Why do my led bulbs state: not for use in totally enclosed luminaires?

Even if LED or even CFL bulbs create far less waste heat than a conventional lightbulb, they react far more adversely to the heating resulting from ANY waste heat. A lightbulb won't care if it is in ...
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21 votes

Can I safely use a 9w LED bulb in place of a 40w incandescent?

SHORT ANSWER: NO PROBLEM LONG ANSWER: The maximum wattage limits are largely a function of heat. For incandescent lights, more wattage means more heat. And too much of a heat buildup could result in ...
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  • 33.1k
19 votes

How much power do LED smart bulb wireless control systems consume when the light is turned off?

The specs are out there, just not always so easy to find. For example, one Philips Hue is rated at 9.5W with max. standby of 0.2W. (Click "The bulb" on the right side under Technical Specifications). ...
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19 votes
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How can I install an on/off indicator for a lighting circuit?

It sounds like you have light bulbs or fixtures directly controlled by Alexa/Google Home. A better solution, though sometimes a bit more work to install, is a smart switch. With a smart switch, the ...
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18 votes

Why do LED Lights Flicker on Low Dimmer Setting

LEDs on AC Power Don't Like to be Dimmed. Period. (LEDs on DC can actually be dimmed quite easily - just look at an older battery powered LED device (like handheld computer games from the 1980s) and ...
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18 votes

LED Light bulbs burning out much sooner than expected

Advertising around LED bulbs is a big problem today, and it was even a problem back when "long life" compact florescent bulbs came out. The issue is that the actual LED will in fact last ...
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  • 26.6k
17 votes

Is an extra 1 W that significant with LED bulbs?

I think you misunderstood the instruction manual. Where it reads "LED bulbs (9-Watt, Maximum)" is in the parts list. This is not giving the fixture rating. It is saying that the included ...
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  • 171
15 votes
Accepted

Why do LED Lights Flicker on Low Dimmer Setting

The specifications of the LED lights you have say they will dim down to 10% without any flicker or buzzing. Some lights don't go down that far, and some will go even further. Based on the manual for ...
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  • 26.6k
14 votes
Accepted

Can someone explain how this makes sense electrically?

However, if I only turn off the lights breaker, and go into the switch panel with my voltmeter, I am still detecting 100V AC across the switch (with it off), even though the lights stay off when I ...
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  • 3,479
14 votes

LED Light bulbs burning out much sooner than expected

I'd like to know where you folks are getting LED bulbs with constant current sources that can be adjusted. The bulbs I've disassembled didn't bother with such niceties. They have capacitive dropper ...
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  • 378
11 votes
Accepted

LED light bulb flickering in socket, incandescent works fine

Are these the the type of motion sensors which use the neutral wire? A motion sensor needs power to work. Ideally it gets always-hot, and neutral, and then provides a switched-hot to the target ...
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11 votes

Is is safe to use LED strips that shine onto stair risers instead of directly onto treads?

I don't see any problem with mounting them in that way. Effectively you just use them as indirect lighting. They still provide some illumination to the steps themselves, just at lower intensity. Just ...
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  • 605
11 votes

Is is safe to use LED strips that shine onto stair risers instead of directly onto treads?

It's a bit 'form over function'. It's the kind of lighting bars trying to look 'cool' use & which three drunks a night fall down, because they can't figure out where to step. Would it not be ...
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  • 4,131
11 votes

What are the different types of LED tubes on the market?

As you problably know, electricity flows in loops. It needs 2 wires/contacts/etc. to be effective. You also may know most fluorescent tubes have 2 pins per end, or 4 total. That is more than is ...
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10 votes

What should I do to increase the dimming range of LED bulbs?

I'm in same boat. When I redid the house I'm in, I installed as much LED lighting as I could and the rest is halogen. What I've learned is, dimming range is based completely on the driver in the LED ...
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  • 4,356
10 votes

Is an extra 1 W that significant with LED bulbs?

The maximum power ratings are set by the design of the fixture. If it says 9W max. then you run a risk or damage or fire by exceeding that. Going from 9 to 10 W is a GREATER than 10% increase.
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  • 20.3k
10 votes

Is an extra 1 W that significant with LED bulbs?

The manual is vague, but I think the trick here is what I like to call "old wattage". Back in the not-so-dark dark ages of light bulbs, everything was incandescent. Incandescent wattage was ...
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  • 19.7k
10 votes

LED Light bulbs burning out much sooner than expected

My background: When I was in engineering school I worked summers at a Westinghouse light bulb plant (eventually in the engineering department). This was a very long time ago (when tungsten filaments ...
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  • 201
9 votes

LED lights delayed when turned on

It's not the wiring. It's the LEDs themselves. LEDs have a characteristic delay when turning them on which may be more than you're used to from a lifetime of incandescent bulbs. Swap the LEDs ...
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9 votes

Energy Star LED bulb benefits?

The first problem here is the "100W" claim, which you here treat as the reference standard from which to compare. Actually, it's the most dubious claim of the bunch, and has never been reliable. I ...
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9 votes
Accepted

Is a grommet needed for romex into this metal junction box?

You don't use a grommet in this application but rather an appropriate clamp. The correct type depends on what you are connecting here but the usual thing for non-metallic cable is something like this:...
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  • 20.3k
9 votes

Is is safe to use LED strips that shine onto stair risers instead of directly onto treads?

For someone who is partially sighted and doesn't have depth perception, it may easily look as though the lighted riser is the part you are supposed to step on. Do you remember those optical illusions ...
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  • 191

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