David Brenner, the director of the Center for Radiological Research at Columbia University’s Irving Medical Center, leads the university’s research with far-UVC light. His team isn’t affiliated with the installation of this technology in New York stores, he writes via email, but he says that after nearly a decade of studying far-UVC light on mice and human skin cells, “the evidence we have acquired to date, even at these much higher doses than one would use in the real world, are all reassuring.”

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UVC light doesn’t discriminate when it comes to ruining genetic material, though, and can damage human skin and eye cells. Some particular UVC wavelengths have been associated with skin cancer or cataracts, Bolton says. Sanitation procedures that use the light, like the robots wheeled into hospitals, operate when no one is around to get hit by the harmful wavelengths.

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Hi Everyone, I’m trying to create a realistic “laser” beam. I’ve just downloaded Blender 2.64. Discovered, happily that it does support the “spotlight”. In Cycles I reduced the cone to 1degree. Reduced the size of the lamp. Then discovered that the light is not rendering at all. The strength is at maximum. The color is Red 10.0 against a dim white background. I used a mixer of Emission strength 1,000 and Glossy roughness 0.0. I hnhave cycled through every kind of lamp and the only one i can get to render is the area lamp. Which of course, does me NO GOOD at all. PLEASE HELP!.. Ideally i’m trying to create a pure red beam of light that will stay collimated and be 3.5mm in diameter.

According to reporting by the New York Post, Magnolia Bakery plans to install lightbulbs that emit “far-UVC” light. For now, the bakery will place a metal detector-like arch — or “portal” — above their doorway that douses patrons in the UV rays. And the bakery told the Post it will replace lightbulbs inside its stores with these special varieties.

“I was quite shocked to see this portal come out,” says Karl Linden, an environmental engineer at the University of Colorado Boulder. Linden has spent decades studying UV light as a way to disinfect surfaces and water, and says that it’s exciting to see increased interest in the sanitation technology. But without long-term studies showing “far-UVC” doesn’t harm people, “my excitement [is] tempered with the concern that it could be an application that could have some dangerous side effects or direct effects.”

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Linden has studied this specific UVC wavelength too — he’s starting a research project investigating different kinds of UVC light to figure out which kinds do the best job of disinfecting surfaces of SARS-CoV-2. But neither Linden nor Bolton are aware of studies that have looked at how humans fare when spending a lot of time under far-UVC light. The only completed research looking for health problems from regular exposure has been in mice. In one of these studies, the rodents sat under the rays periodically for 10 weeks and didn’t develop any tumors.

Ed Nardell, an infectious disease researcher with Harvard Medical School who has spent much of his career examining UV sanitation, also thinks far-UVC light is safe enough to use. The light is so easily blocked by dead skin cells or clothing, he says, that it can be a harm-free method for disinfecting the air in front of people’s faces — say, in a nail salon between technician and client.

The great photographer Ansel Adams once quipped that, while a picture is captured in a camera, it is made in a darkroom. The compositor is the ultimate “digital darkroom.”

But Linden thinks the data available on far-UVC is promising so far, and it’s encouraging to see other applications of UVC disinfecting become more popular, as it can be effective and doesn’t involve introducing new and potentially harmful chemicals into an environment. But with far-UVC, the almost sci-fi fantasy of passing through sanitizing lights seems to be materializing quickly. “I think it makes a lot of people uncomfortable. Whether or not it’s safe or not, we’ll need to find out and see what the evidence says,” Linden says.

Pathogens floating alone in the air, however, lack a barrier of dead cells that can come between the far-UVC and their own precious genetic material. In theory, if a person was breathing out clouds of microbes and stood under a far-UVC light, the beams would mangle the bacterial DNA but wouldn’t get past your nonliving tissues to your healthy skin and eye cells.

A desperate need for sanitizers has driven people to look for options beyond the spray nozzle. For a couple of bakeries in New York, that means installing experimental lighting in their entryways that is supposed to disinfect pathogens without harming humans.

But without more research into how humans fare with this kind of light exposure, others think some questions are left unanswered. It’s important to be sure that these lights won’t harm employees who are standing under the bulbs for entire shifts, for example, or to know how people with preexisting skin or eye conditions will fare, Linden says. There are also uncertainties around what types of light installations will kill SARS-CoV-2. So far, research suggests that far-UVC dismantles SARS-CoV-2 RNA, Linden says, and that it can do so very quickly when the virus is floating in air. What UVC wavelengths do it best — and how long they need to target the coronavirus to ruin its RNA — is part of his upcoming research.

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Thank you all for your incredibly timely responses. I’veused the glowing 3.5mm cylinder in previous animations successfully. In the 2new animations i’m working on; if i go that route i’ll have to create, animateover 280 individually edited cylinders, each with separate tapered angles. Doyou have any information about “Compositing” a solution? I agree withthe side of a real laser not being visible. I’d rather introduce a very lightmist in the beam path to make it visible. Is this possible using a largelytransparent particle field. Making the actual realistic beam that would reflectvisible will save me literally days of animating… THANK YOU ALL FOR YOURASSITANCE!!!

If i have to go the “glowing cylinder” route. Which I’ve used successfully in previous animations; I’ll have to create about 280 cylinders. Each with individually edited separate angled ends to show accurate reflections off a changing mirror. Could you PLEASE explain further the “Compositing” solution. I’d also rather just use a small cloud of mist in the area to make the more realist beam visible. In addition, I still can’t even get to the spot from the spotlight to render on a reflective surface. THANK YOU FOR ALL YOUR TIMELY RESPONSES!! Greatly appreciate all further comments!!

“Now, the world is your oyster.” You create another blend-file which uses the node-based compositor to merge the laser-beam into the shot. But… you can, in the process, do anything-you-want to and with this stream of digital information. (It is a digital computer, after all …) You can add noise to it (producing the effect of “passing through clouds”), color it any way you like, even animate that color. You can fine-tune the effect of alpha, and choose among a dozen choices of exactly how to combine that laser-beam with the rest of the shot. You can “tweak” the laser-beam without re-rendering anything else, and vice-versa.

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In real life you see the laser beam only if it passes thru dust/mist/vapour or something of that kind; otherwise the only thing you see is a small, painfully luminous dot on the place where the beam hits an object. Any more intimate contact between you and the laser preludes to the acquisition of an eyepatch and (optionally) a cursing parrot.

“Far-UVC” light is supposed to be the exception to this rule, according to the Columbia University research team that came up with the concept. The term “far-UVC” refers to a specific subset of UVC wavelengths. Light that falls within this narrow range appears to get absorbed by superficial and nonliving layers of the eyes and skin. On the latter, for example, the top two layers are always dead skin cells, Bolton says. By taking in all the UV light, dead cells shield living cells beneath them from harm.

So far, the evidence maybe isn’t where it should be. “If I was a regulator,” Bolton adds, “I’d certainly want to see more research and would not allow the use of this technology in a practical application.”

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The use of a far-UVC “disinfecting portal” that someone has to walk through, however, doesn’t hold up. “If the intention is to somehow render the customer less infectious, or to protect them from having been infected on the way out, [it] is — there’s no other word for it — stupid,” Nardell says.

The glow cast on bakery customers is the product of years of research at Columbia University. So far, studies show this light does a good job of ruining the genetic material inside some pathogens, such as the H1N1 virus or the bacteria known as MRSA, all while leaving mammal skin cells relatively unharmed.

On the electromagnetic spectrum, UV light sits between visible light and X-rays. We can’t see it ourselves, though it is present in sunlight and pretty good at damaging our DNA. This light is why you slather on sunscreen — the lotion protects you from two kinds of UV light, UVA and UVB, which are responsible for premature skin wrinkling, sunburns and skin cancers. The third kind, called UVC, has too short a wavelength to cut through Earth’s atmosphere and reach our skin, so it’s not a threat to sunbathers. But it can be re-created in a lightbulb.

Having so little of someone’s body, like their face and hands, exposed to the light before entering a business wouldn’t disinfect much of a virus. Besides, if someone is infectious, they will still be breathing out the pathogen after passing through a far-UVC light and releasing the particles near whoever they are interacting with. “It is a bad application of a really good technology,” he says.

“The compositing approach” would involve you creating a separate animated sequence in which the output consists of just the laser-beam, with its corresponding alpha-mask, in an otherwise absolutely-empty frame. (There is no “world” color, no nothing in the frame at all, except that laser-beam.

The Columbia University lab that first pitched the term “far-UVC” has shown its effectiveness at disinfecting at least the H1N1 virus and the bacteria known as MRSA, and the team is working to crowdfund research on the virus causing our pandemic: SARS-CoV-2.

+1 to Richard’s suggestion - it could involve a bit of compositing, but you can probably get a lot more control over the Lazor you’re Firin’ that way

I suggest that you generate a directory full of MultiLayer output files, which will capture the entire numeric data-set produced by this and every other rendering step.

But the installation of far-UVC lights in the real world has surprised some experts. In March, the FDA released a document allowing UVC disinfectant devices to be used in health care settings during the COVID-19 emergency. However, there doesn’t appear to be any published research on how far-UVC may or may not impact humans exposed for long periods of time — an important step, seeing as other kinds of UV light damage skin and eyes.

Research has found that UVC degrades genetic material like DNA so severely, microbes or viruses hit by the rays can’t multiply. “It doesn’t kill the virus — it renders it unable to reproduce,” says Jim Bolton, an environmental engineer at the University of Alberta. The pandemic has made UVC light disinfection much more popular, with hospitals and even the New York City subway system buying into the technology.