Incandescent/halogen ban?

Sirius Glass

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koraks said:
You're an engineer. As such, you should have no trouble figuring out the relationship between capacitance, a discharge curve and the forward voltage of an LED.
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Non necessarily. One would need a well equipted laboratory and even then one still might not be able to measure it.
 

koraks

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No Sirius, not really. It's a paper napkin kind of thing based on the theory offered at around the 2nd week of the first semester of electrical engineering. Plot voltage over the cap as it discharges, compare to forward voltage of LED in the knowledge that LED light output is vastly non-linear with voltage applied.
 

Sirius Glass

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That is if it is a simple RC circuit as circuits get more complex the picture may not be so clear. That is why their are higher level active and passive circuit analysis and synthesis courses which I taught, but you were never in my classes. Besides aren't moderators supposed to be paragons of politeness and tact?
 

koraks

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Sirius Glass said:
That is if it is a simple RC circuit as circuits get more complex the picture may not be so clear
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If you want to figure it out to the microsecond, yes. But for a ballpark estimate to figure out if a 1 second afterglow is caused by a buffer cap, there's no need to fire up a SPICE simulation.


Sirius Glass said:
Besides aren't moderators supposed to be paragons of politeness and tact?
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We didn't come down from Olympus to enlighten mankind. My remarks are/were made as a regular user; see my signature. Feel free to report offending posts; I can guarantee you that I will never handle a report ticket on one of my own posts.
 

faberryman

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Not even Drew thinks a 1 second afterglow on his overhead darkroom lights is a problem, so why is everyone else worried about it?

Is this one of those "my slide rule is bigger than your slide rule" kind of things?
 
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Sal Santamaura

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koraks said:
...I'm done here.
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Sirius Glass said:
...aren't moderators supposed to be paragons of politeness and tact?
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faberryman said:
Not even Drew thinks a 1 second afterglow on his overhead darkroom lights is a problem, so why is everyone else worried about it?...
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No one is worrying about that on overhead darkroom lights. As previously mentioned, it's fluorescent overhead lights that one must be concerned about, since their afterglow can last as long as minutes.

However, remembering that the topic of this thread is enlarger bulbs, replacing an incandescent one of those with an LED bulb would make a 1 to 1-1/2 second afterglow rather problematic.
 

Sirius Glass

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What you are measuring is the imaginary component of the complex number of the reactance of the total circuit which may contain multiple capacitors, possibly inductors and in this case nonlinear components.

I would advise a visit to Olympus and Delphi. Most instructive.
 
  • jRodinal
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DF

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Will Banning Incandescent Lightbulbs Have a Negative Impact on Traditional Film Photography/Cinematography?​

Anywhere - from bulbs needed to make up a functioning darkroom to traditional film movie making...?
 
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BobUK

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Even the world famous Hong Kong skyline is rapidly losing it's neon lights.

Blade Runner style skylines and streets are changing to LED lighting.
Various causes are aired by people.
Government safety issues with older style equipment.
Expense of replacing with similar neons.
People leaving the industry, and lack of skilled labour, doubtful.
Cheaper LED's.
No one has mentioned the environment yet.

I do not think the LED street signs have the old charisma of a red neon above a shop or bar entrance.

Lovers of wet street, fuzzy neon photography had better get their skates on. Time is running out.
 

koraks

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BobUK said:
Blade Runner style skylines and streets are changing to LED lighting.
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It's funny, isn't it, that a film set in 'future' 2019 turned out to be 'wrong' in something as mundane as this. Goes to show how darn difficult it is to predict technological evolution.

BobUK said:
I do not think the LED street signs have the old charisma of a red neon above a shop or bar entrance.
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Neon does have a special kind of glow to it.
 

Ivo Stunga

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I sport a chain of diy incandescent lights on dimmer for my terrace. The quality of light is superb and even I can afford those few dozen hours a year.
Similarly to neon - incandescent has its own characteristics that are unique to it, and I probably will import them in a case of total ban - I love them exactly that much for some rooms and places in need of moody, warm electric lighting.

Living in northern hemisphere I even welcome the heat output from 200W bulb in my living room: I need that heat, it's not wasted in my case and some heat their houses on electricity anyways lol

So it's a bit silly in North, a bit greenwashy
 

btaylor

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DF said:

Will Banning Incandescent Lightbulbs Have a Negative Impact on Traditional Film Photography/Cinematography?​

Anywhere - from bulbs needed to make up a functioning darkroom to traditional film movie making...?
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Film production switched to fluorescent and then LED years ago. Generators can be much smaller, cables and distribution boxes much smaller, and heat on the talent and on set is much reduced. Other than the initial cost it’s a huge win.
 

Bronson Dugnutt

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I'm still waiting for the carbon arc lamp to make a comeback. In the meantime, low wattage tungsten bulbs (<35W) are my preferred continuous light source in the studio. Double-X in particular produces very nice results under incandescent light.
 

DREW WILEY

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Initial cost? - Yep. But what film production switched to is in a much higher orbit, quality and price wise, than what we're talking about in terms of residential lighting or even typical camera store offerings. Even here, where there's quite an active cinema industry, nearly all of that quality of lighting is being rented out for shoots, rather than outright sold to them, due to the very high cost involved.

I'm typing this under architectural grade LED studio floodlights - about $35 a bulb. The cheapo kind gives me eyestrain, and isn't suitable for displaying print colors either, so I'm glad I spent a bit extra. These should last a lot longer too.

Otherwise, there's no worry about getting enlarger and other device bulbs. They're exempt from the mandated changes.
 

mshchem

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I use a 15W incandescent bulb for my bedside lamp. No one makes a led that produces the same kind of light.
The flicker nonsense of leds is annoying when using a camera.
 

RalphLambrecht

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ags2mikon said:
Why the "ban" on incandescent bulbs? If LED bulbs are better then everyone will quit buying incandescent bulbs and go LED right? What is wrong with letting everyone choose what they want to light their homes with?
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because the general public has proven to act selfish and irresponsibly unless 'guided' by law
 

Ivo Stunga

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What's selfish and irresponsible by running non-flickering tungsten lighting with superb CRI in North, letting it contribute to much needed heating? it's just a banhammer - that isn't a fine-tuned instrument.
It's that upfront cost that keeps people away. A country could help out, educate and even subsidize if energy savings is the true reason. But banning is just easier?
 

DREW WILEY

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What was never factored in was the eyesight-related and stress/sleep loss/obesity related health costs associated with all these new discontinuous light sources - computer screens, cell phone addiction, wretched spectrum cheapo interim room lighting. Cataracts was mainly an old-age disease; now it's hitting many people in midlife. What will happen to children? That's what I call irresponsible. ... oh well, the Mod axe might drop soon at this rate. It is what it is. I'm wearing appropriately tinted computer glasses right this moment, and have the screen brightness adjusted as low as it will go.
 

mshchem

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incandescent lamps are heaters that produce beautiful light. People needed education not a complete ban. I'm the first to adopt more efficient technology, the masses will adopt technology that's going to save them money and make life better. Bans are not as good as a gentle nudge, a carrot instead of a big stick. MHOFWIW
 

DREW WILEY

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Too late. There aren't many carrots left. Of course, all this started at least a couple decades ago, and gradually got phased in. The the tsunami of abominable CFL bulbs came in, and the LED revolution is distinctly underway, with its own deluge of trash lighting, unless you know where to go for the good stuff.
 
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