General > General Technical Chat
Biden admin moving forward with light bulb bans in coming weeks
Wallace Gasiewicz:
Quote from: Nusa on Yesterday at 09:46:25 pm
Several things incandescents are better at:
1) Surviving hot environments, such as providing illumination inside an oven. Or in old fixtures that have ZERO ventilation (the fixture was designed for the heat, but the alternative bulbs die from their own heat -- found out the hard way.)
2) Being used as load resistors, with feedback, also known as a dim bulb tester.
3) When being used for their secondary function, providing heat rather than light. They're rather good at it.
That said, modern LED's have gotten acceptable, and I use them for lights I use regularly. Lights I use less than an hour a year I've never bothered to change. Nearly all the closets still have old-school 100W bulbs in them. Even counting electricity, they aren't cost-effective to change at this time.
One or two incandescents can take the edge off the cold in a small chicken coop or a doghouse.
--- End quote ---
RJSV:
Gyro:
Sorry to be unclear. My experiences aren't at the electrical rate, probably would have appearance of flicker even with a DC lamp...(or natural sunlit room).
It's as if each cardiac pressure pulse causes a slight momentary decrease in ambient light in the room.
So that's exactly in sync with 50 BPM heart rate, which is closer to 1.2 seconds elapsed.
Yeah, might be classed in migraine-like exp.
Someone:
--- Quote from: schmitt trigger on April 04, 2023, 02:07:52 am ---
--- Quote from: Nusa on April 03, 2023, 09:46:25 pm ---Several things incandescents are better at:
1) Surviving hot environments, such as providing illumination inside an oven. Or in old fixtures that have ZERO ventilation (the fixture was designed for the heat, but the alternative bulbs die from their own heat -- found out the hard way.)
2) Being used as load resistors, with feedback, also known as a dim bulb tester.
3) When being used for their secondary function, providing heat rather than light. They're rather good at it.
--- End quote ---
4) For museums and art galleries. Woe on the art director who dares to display a painting illuminated by LEDs or CFLs.
--- End quote ---
Yet conservators like that LEDs dont require filtering to remove UV and IR
https://www.canada.ca/en/conservation-institute/services/conservation-preservation-publications/technical-bulletins/led-lighting-museums.html
High CRI LEDs are cheap and commonplace, with only a small hit to efficiency.
jonovid:
looks like US is becoming like a part of Europe and its environmentalists policy
go figure! former first ??men & the former 44th is in the driver's seat of the geriatric 46th POTUS
as the 45th go,s to court. :palm:
tooki:
--- Quote from: schmitt trigger on April 04, 2023, 02:07:52 am ---4) For museums and art galleries. Woe on the art director who dares to display a painting illuminated by LEDs or CFLs.
--- End quote ---
The thing is, the best LEDs are so good that you’ve almost certainly seen them and simply assumed they were incandescent.
As Someone said, they have significant advantages for conservation. Many people don’t know that there are two kinds of halogen reflector bulbs, one of which was commonly used in museums and the like. One has fully-metalized reflectors that reflect everything, including IR radiation. This means they can’t be pointed at objects that are heat-sensitive, but the bulbs don’t need any special considerations for the lamp fixture. The other type uses a dichroic reflector, which reflects the visible light but allows the IR to pass through. This dramatically reduces the heat radiated together with the visible light, but places special requirements on any enclosed fixtures, since they must be capable of handling the heat. For example, this may preclude the use in recessed fixtures.
LED doesn’t have those drawbacks: they run very cool (compared to incandescent and halogen) and IR-free, both in the fixture and at the object.
Additionally, they make specially tuned LEDs for specific applications. For example, for grocery stores, they have LEDs with spectra optimized for meats, others for vegetables, another for bread, etc. It wouldn’t surprise me at all if they make museum LEDs optimized for specific types of objects.
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