Archive for the ‘Lighting’ Category:

2018-01-17 Power Outlets Made From Electric Outlets

From FB comment to Bill Sherman’s post Bill Sherman The cable jacket may be too big diameter to fit into the clamp. But you might consider the special 20 amp plug, the one they put on the power strips that are used in the server racks. I forget what they’re called, but we specified those

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2019-01-10 The Ninth Anniversary Of The Philips LED Candelabra Lamp

On Jan 11, 2010 I connected a Philips candelabra lamp to the AC line and turned it on, and for the last nine years it has been running continually, except for a few days time when the power was out, which might add up to a few days, probably less than a week. I did

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2018-10-16 Major Power Outages In Neighborhood

from FB group Orange Talk Oct 16 Melissa McQuary Moser I grew up in a neighborhood that used ‘antiquated equipment’ and we didn’t have these long term outages. I’ve lived in Orange for decades close to Edison’s main station on Tustin and Taft, and our neighborhood had major outages lasting for hours. We remember the

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2018-07-30 How Are LED Lights Made Dimmable?

From FB comment to Bill Sherman’s candelabra lamps. Bill Sherman Sometimes I wonder what is meant by dimmable. If a LED light uses hundreds of microfarads for the DC filter capacitor, then when the light is dimmed, the long time constant causes it to flash on and off when it is dimmed. So if the

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2016-09-03 The Light Bulb Conspiracy – Not Really

There may be a Light Bulb Conspiracy, but it’s not what you think! First, let’s discuss the Light Bulb Conspiracy claim. They said that years ago, incandescent light bulbs lasted for 2500 hours, but now they last for only 1000 hours. They claim that this is a conspiracy to sell more products “by planned obsolescence.”

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2016-07-26 Surge Protectors

I have read about, discussed and experienced how surge protectors work and don’t work, and have written about it before, but Ill try again to explain. Ripoff The most egregious thing surge protectors do is take your money. One of the highest, if not the highest profit margin devices in your home is a surge

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2016-02-16 Daylight LED Light Prices

I had to go to the big box home improvement store yesterday, and although I didn’t find the screws I was looking for, I did find that they had LED lights on pallets. I saw both warm white and daylight LED lights of the ‘stick’ kind, I believe one maker calls them bright sticks.  I

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2015-11-30 Low Power Joule Thief With Daylight Shutoff

This has been blogged, here and here.  I added a CdS photocell (resistor with a circle around it) to shut it off during daylight, thus conserving the AAA cell.  I used a 100k resistor for the base bias, so it draws very low current from the cell.  I can then call this a low power

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2015-10-30 LED Nightlights Are Poor Design

I found these at a Walmart store.  They’re named Great Value and came in a package of four nightlights.  As usual, curiosity made me open it up to see the circuit inside. I traced the circuit and drew a schematic of it.  I was disappointed, but not surprised.  The way the CdS photocell works is

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2015-07-21 GE Bright Stik LED Light Bulb

I went to Home Depot this weekend to buy some stuff to fix the leaky toilet, and I walked past the display for the new GE Bright Stik LED light bulbs.  I was attracted to their shape and small size. They come packaged 3 to a box, and there were two types: bright white and

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