Hot answers tagged

55

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 minute or two, over and over. Eventually they just stay dim and then go out a month later. Can someone tell me what the problem is and how to fix it? They are ...


18

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 1000's of hours, but the supporting electronics and heat control fail much, much sooner. Sometimes they fail sooner than an old incandescent light would have. ...


13

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 circuits in them. They depend entirely on the line voltage and the capacitance to keep the current (somewhat) correct. Here's a bulb I tore apart last year: It ...


9

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 ruled the world), before Westinghouse sold that business to Philips. One of the things we did was try to figure out why we'd get consumer returns. My dad was ...


4

Can someone tell me what the problem is and how to fix it? I can see two possible reasons for this happening: The bulbs are sensitive to the exact line voltage you have in your Home. I would start by getting a simple digital Voltmeter (probably less than 10 dollars) and check the voltage. Line voltage can and do vary between different houses depending on a ...


3

There are multiple types of retrofit kits. Universal they can work with a ballast or be direct wire. Ballast only these lamps usually have a list of ballasts that work with the LED lamps. And direct wire only, these the ballast must be bypassed and the tombstones can not be shunted. So yes there are some LED lamps that can work with some ballasts.


3

I personally feel the word "driver" should ONLY be used to describe constant-current power sources. A constant-voltage supply is just a "power supply". The whole point of a standard socket is so a variety of fixtures can accommodate bulbs in many styles from many makers.* When a standard socket exists, the common lingua franca of all ...


2

LED and CFL bulbs generally get warm near the base. That part of the bulb has power converter electronics that convert the 120V AC line power into whatever your bulb requires, and these types of circuits can dissipate excess energy as heat (depending on how exactly they're designed). Also, LED bulbs in particular can have large metal heat sinks in the base ...


Only top voted, non community-wiki answers of a minimum length are eligible