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Old 05-30-2018, 06:18 PM   #61 (permalink)
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http://www.emsd.gov.hk/filemanager/e...64/t5guide.pdf

Power factor is 0.95.
Power consumption of the ballast alone is 4-6w

You continue to waffle on about power factor when it has already been explained to you that domestic power meters measure watts, not VA.

You cherry pick the best ever fluorescent, inflate it's performance, then compare it to the worst ever leds and fudge their numbers to make them look worse. That is deceptive and misleading

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Old 05-30-2018, 06:47 PM   #62 (permalink)
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I spectrum analyzed both CFD and LED lights and neither carry anything resembling a full spectrum. They just appear white because the frequencies they emit trigger all 3 of our color receptors.
Basically they have the same problem - converting either deep blue or ultraviolet light to lower frequencies by fluorescence, but each component in the fluorescent dye only produces light of a single bandwidth - one color. You need a rich mix for a good spread.

That said, normal incandescent bulbs lack in blue and purple. Even a 'warm' colored LED brings out blue details better than the old stuff.

I replaced my last CFD lamps with top tier LEDs - finally some that outperform them in lumen and don't fail within a month or two... and they only get lukewarm, where the CFD's got scorchingly hot.
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Old 05-30-2018, 06:59 PM   #63 (permalink)
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My information was out of date and judging by what's still being sold to consumers still very much relevant. You talking about LEDs that directly produce white light, these appear to be uncommon at most, you talk about them as if that is the only way they have ever been made.

I have already tested rotery meters and they do read VA. If you tested it you would know too. The digital ones appear that they are programmed to read anything greater than 0.8 to 0.85 as their own units. Then depending on the utility they set the meters to collect low power factor watts. This is based on my own observation of the meter and the bill that comes in.

T5 technology kind of peaked in the mid 2000s. I only pick T5 because that is most of what I use, most LEDs weren't even around. I didn't cherry pick these LEDs I use for my examples, they are what's on the shelf at the local national chain home goods and hardware store that has several thousand store locations all across the county, with items easily accessible by 100 million or so people. I already said there are LEDs on the shelf that are at least as efficient as the T5 system but almost no one buys them because they are more than double the price.
So we know what's going to happen when super high efficiency higher priced LEDs hit the store shelves, they are going to sit there, collect dust, sit there some more, get moved around and eventually end up on the mark down junk pile being sold at a loss.

Plus I am preparing as much as possible to go off grid, any low power factor penalties are fully realized when you generate your own power.
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Old 06-12-2018, 05:46 PM   #64 (permalink)
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I read the institutions on some of the LEDs I bought. Says that they are not for environments above 113F.
So I can't use them any time during the day in the summer in uncooled shed, out buildings and garage.
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Old 06-13-2018, 12:52 AM   #65 (permalink)
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Probably can't cool off fast enough. Not an issue around here.
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Old 06-16-2018, 04:46 PM   #66 (permalink)
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At lowes I found some 3000k "250w replacements" that make 3000 lumen and use 275ma.
That means these LEDs run about a 0.97 power factor and make 90 lumens per volt amp. And they are the same price or cheaper than the older, bluer 65 lumen per volt amp LEDs.
It's about time.

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