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Old 01-23-2015, 10:52 AM   #1
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Who knew?

Yesterday I replaced all the old-style bulbs in the fixtures in my Bigfoot with LEDs. What a difference! But, that isn't what this discussion is about.

I just discovered that my hand-held solar calculator doesn't work with LEDs. I had to position the calculator under a small lamp with a regular bulb before it'd light up.

Maybe some of you in-the-know folks could explain why?
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Old 01-23-2015, 01:22 PM   #2
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Originally Posted by Ev in Oregon View Post
Yesterday I replaced all the old-style bulbs in the fixtures in my Bigfoot with LEDs. What a difference! But, that isn't what this discussion is about.

I just discovered that my hand-held solar calculator doesn't work with LEDs. I had to position the calculator under a small lamp with a regular bulb before it'd light up.

Maybe some of you in-the-know folks could explain why?
Most calculators use Liquid Crystal displays. While LED's are efficient they still draw power, more than a small solar cell can provide. LCD's rely on reflected ambient light and use virtually no power at all. Raz
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Old 01-23-2015, 07:12 PM   #3
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Thanks for the explanation, Raz. I try to learn something new every day -- this was it for today!

I figure by the time I'm 100, I'll be as smart as I was when I was a teenager.
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Old 01-23-2015, 10:46 PM   #4
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I figure by the time I'm 100, I'll be as smart as I was when I was a teenager.
Diet Coke just shot out of my nose
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Old 01-23-2015, 10:52 PM   #5
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I figure by the time I'm 100, I'll be as smart as I was when I was a teenager.[/QUOTE]

Some time ago I was at a roadside dinner. on the counter there was a sign, "Hire a teenager while they know everything".
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Old 01-24-2015, 04:40 AM   #6
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Yea what he said. Makes my head hurt ��
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Old 01-24-2015, 05:31 AM   #7
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My favorite


“When I was a boy of fourteen, my father was so ignorant I could hardly stand to have the old man around. But when I got to be twenty-one, I was astonished by how much he'd learned in seven years.” Mark Twain
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Old 01-24-2015, 06:53 AM   #8
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Re-learning the 14 to 21 lesson.

I have an older friend, Tony, in our Escapee Park that I have written about in the past. Tony is a very healthy 82 and spent 15 years full-timing.

I emulate Tony in many ways. Like Tony I faithfully do my morning exercises and often take a short after lunch Tony, a nap. Many mornings I walk 3 loops of the park with Tony sharing opinions on the park and the world. Our opinions often are not the same.

Yesterday while in a private moment on an interesting tour of an orange orchard I told Tony "though we sometimes have different opinions that I always appreciate your sharing of 'well considered' opinions".

I recognize that his additional years of experience is valuable and that sometimes it takes me years to recognize I was wrong about this or that. As well telling some one you appreciate them or their thoughts is important, a little 'I Love You' goes a long way.
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Old 01-24-2015, 08:46 AM   #9
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Originally Posted by Ev in Oregon View Post
Yesterday I replaced all the old-style bulbs in the fixtures in my Bigfoot with LEDs. What a difference! But, that isn't what this discussion is about.

I just discovered that my hand-held solar calculator doesn't work with LEDs. I had to position the calculator under a small lamp with a regular bulb before it'd light up.

Maybe some of you in-the-know folks could explain why?
Here is the story: the calculator uses a solar cell to get its power. Sunlight and incandescent light is broad band, including infrared, and the calculator gets enough power from it. LED's are efficient, narrow band light sources. Even the new "white light" LED's are emitting very little energy in narrow red, green, blue bands. So you get white light, but not much energy out of it. That is the key to the power savings you enjoy with the LED's. (In a simplistic way - less power in, less power out.)
Paul
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Old 01-24-2015, 10:15 AM   #10
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Here is the story: the calculator uses a solar cell to get its power. Sunlight and incandescent light is broad band, including infrared, and the calculator gets enough power from it. LED's are efficient, narrow band light sources. Even the new "white light" LED's are emitting very little energy in narrow red, green, blue bands. So you get white light, but not much energy out of it. That is the key to the power savings you enjoy with the LED's. (In a simplistic way - less power in, less power out.)
Paul
Agree with Paul - on a business trip I recall running a calculator at a dinner meeting by the light of another engineers cigarette lighter as the room lighting didn't provide enough juice.
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Old 01-24-2015, 11:31 AM   #11
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Originally Posted by Paul O. View Post
Here is the story: the calculator uses a solar cell to get its power. Sunlight and incandescent light is broad band, including infrared, and the calculator gets enough power from it. LED's are efficient, narrow band light sources. Even the new "white light" LED's are emitting very little energy in narrow red, green, blue bands. So you get white light, but not much energy out of it. That is the key to the power savings you enjoy with the LED's. (In a simplistic way - less power in, less power out.)
Paul
I assumed Evelyn was asking why her calculator didn't use an LED read out. But rereading it I think Paul's interpretation is correct. That said, my solar calculator works fine under a White LED. Unfortunately I have no idea which technology my LED light uses. Some white LED's use blue with a yellow phosphor and some are a combination of Red Green and Blue. Perhaps others can try their solar calculator under a white LED and report back if it works. Raz
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Old 01-24-2015, 03:28 PM   #12
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And one more thing...

So, when I turned on my radio this morning to listen to the news, I got such a loud buzzing noise that I had to turn it off. I had the kitchen light on (with the new LEDs), so I turned it off & the buzzing stopped. Tried it again, same result.

Luckily, my laptop doesn't seem to be affected by LED orneryness, so I got to listen to the news after all.

I'm easily entertained, so this has been kinda' fun, actually!
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Old 01-25-2015, 06:45 AM   #13
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Originally Posted by Ev in Oregon View Post
So, when I turned on my radio this morning to listen to the news, I got such a loud buzzing noise that I had to turn it off. I had the kitchen light on (with the new LEDs), so I turned it off & the buzzing stopped. Tried it again, same result.

Luckily, my laptop doesn't seem to be affected by LED orneryness, so I got to listen to the news after all.

I'm easily entertained, so this has been kinda' fun, actually!
Most electronic devices today contain oscillators. You will find them in calculators, computers, converters, just about everything. These circuits can produce electrical noise that can propagate for a very short distance. They are like little radio stations only instead of music the just make noise. A portable AM radio placed in close proximity will identify which devices have them. If you have young children in your life, it makes a fun game.

In regard to your original question, I tried half a dozen LED light sources; puck lights, mighty lights, flash lights, some cool white and some warm white and two solar powered calculators. Both calculators works fine with all the lights. I can not reproduce what you described. Sorry, Raz
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Old 01-25-2015, 09:06 AM   #14
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Some LEDs do cause interference with reception on nearby AM radios. The only solution is to try another brand.

Charlie Y
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