Archive for the ‘Lighting’ Category:

2020-02-21

I found that 100 uH was a good all around value for these solar garden light circuits. But at the time I made these around 2009 the 5252 4 legged chip was uncommon and almost all the garden lights used 2 discrete transistors. I don’t know why they started using the 4 legged 5252 –

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LED Indoor Motion Sensing Lights – Decrease On Time

I bought two of these motion sensing LED lights for my hallway. They have a rechargeable cell that is charged through a micro USB port. To see one inside watch big Clive’s YouTube video – the ebay link to buy them is in his description. The charge lasts for more than a week with frequent

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2020-02-08 60 LED Solar Lights Stopped Working – Dead Diode!

From FB group electronics hobbyists Over the holidays I installed two solar 60 LED lights I bought on eBay. They stopped working just a few weeks after. I finally got up on the ladder and took them down to see why they died. Well, spit! The solar panel is plugged into the jack on 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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