As I said earlier Philips EMC complaint bulbs (12V) significantly intefere with my DAB radio. There may be 'no reason' but never let the facts get in the way of a good story.
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7 years ago
LED lamps, source and value
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7 years ago
And your point is, caller?
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7 years ago
[snip]
PS I should have said it is to be found in uk.tech.digital-tv.
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7 years ago
It moves the peak of the curve slightly to the blue. It doesn't make them emit any visible light that wasn't already visible.
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7 years ago
'Visible' is a not entirely relevant concept for someone who is blind. If Brian is experiencing headaches with these particular lights could it not be related to the colour temperature.
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7 years ago
Well, one might complain about them I suppose but if they are compliant you won't have a leg to stand on.
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7 years ago
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7 years ago
Very observant. I cannot even blame it on spellchecker in Usenet - the human version of spellchecker I suppose.
The reason I ask is that I bought some that carried CE marking (which I assumed to be genuine) and was told by the supplier they are not EMC COMPLIANT.
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7 years ago
I was quoting myself this time :-)
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7 years ago
I can't see why it should be.
The outlier is the conventional filament bulb. Halogen light is slightly
*more* like natural sunlight. You could get blue coated filament bulbs to fakte 6000K daylight for photography in the old days.Before modern auto white balance digital cameras film was very tetchy about colour temperature with fluorescents being a green cast disaster.
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7 years ago
It's dennis. He's wrong. He's always wrong. About everything.
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7 years ago
There are fluorescent tubes designed specifically for photography, etc.
In exactly the same way as there were those 'blue' coated tungsten lamps designed for photography.
In other words, use the wrong lighting and you'll likely get poor results.
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7 years ago
[snip]
As a digression, has anyone tried Google Trusted Stores or Paypal for dispute resolution? Is one better than the other?
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7 years ago
Most of the more recent ones seem to be capacitive dropper...
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7 years ago
^^^^ "some" not "most" ;)
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7 years ago
As a matter of interest, why to the 12 Volt ones seem to be more problematic than the mains ones?
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7 years ago
Current to be supplied?
10W from 220V, current to be supplied 0.045 Amps10W from 12V, current to be supplied 0.833 Amps
The low supply voltage power supply is switching high currents. The mains supply is switching low currents.
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7 years ago
That makes sense. I had not thought of that.
I take it this 'switching' is what they used to call 'rectifying' when I was at school? Would it be possible to fit a rectifier to the output of the transformer then use DC bulbs? Would this solve the problem?
Also, I see that the bulbs are AC or DC. Would be be possible to fit a rectifier and use the same bulbs or would the circuitry continue to cause problems?
Do you envisage technical developments resolving this or has the balance shifted in favour of 230V so far as LED is concerned?
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7 years ago
As a follow-up I see there are some EMI free bulbs advertised. I won't post links as some might then question my motives. They seem to be lower-powered and DC.
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7 years ago
Unless you are running them from a 12V DC source, say, on a boat, caravan etc. you may just be moving the problem to the external power supply you have to fit to drive the DC bulbs