Sounds good :-) We thought threre would be quite a few of you out there! Are you already a Viso system owner? If you want an offer, please write to [email protected]

Thanks for the question. The software includes a "sensor" distance guide that allows you to type in dimensions and expected beam angles and get a minimum sensor distance.

I've found the UV lamp in the Viso Light Inspector. So I can get the .IES and .LDT files...

Hi there. Just download our software Light Inspector from www.visosystems.com/download-light-inspector/ and you will find that there is indeed a UV sample measurement included. With File -> Export, you can also generate a UV IES file to play with. Best wishes/Anne

The software already includes a version in French.

Hi there, Our standard systems can run either VIS (360-830 nm), UV-VIS (200-850 nm), UV-VIS-NIR (200-1100 nm), or VIS-NIR (360-100 nm). I hope one of them suits you? Write to [email protected] for more information. BR Anne

Thank you for your positive feedback. We have issued a small step-by-step manual that can hopefully assist you all the way through. Find it here: data.visosystems.com/content/manuals/guidelines_working_with_uv_in_dialux.pdf. If not, feel free to contact again on [email protected]. BR Anne

@@VisoSystems thank you so much

@@Nasir-gu4ek Forgot to say, you need to download the latest beta version 6.56 to have the UV options available. Also, I don't think there is UV light measurement demo example in the standard download. Send an email to [email protected] and I will reply with a demo file attached, so that you have a real Viso measurement to play with.

Hi Douglas. Well, the video example uses an original Viso UV light measurement file exported to IES (or LDT). To work with DIALux in the described way, you just need a UV light distribution file in IES/LDT format. You don't need to import into Viso's Light Inspector software. BR Anne

...forgot to mention: Viso specializes in making such UV-VIS light measurements. So if you need a UV light distribution file, this is exactly what Viso equipment can do.

Thank you for your answer! Is it possible to create a .ies file myself from the Viso system software?

@@douglasbertin2627 Certainly - that is a standard feature. Only thing to remember in UV IES files is that units are wrong. The lumen package will be in W not in lumen. The intensities will be in W/sr, not in candela a so forth. This means that your lighting design result will be in W/m2 - not in lux. As UV sources are often very weak, in often makes sense to manipulate your measurement results before exporting to IES: Simply multiply your overall result with 1000 before export (overall result then in mW). Consequently, lighting design results will be in mW/m2.

Download Viso Systems "Light Inspector" software here: www.visosystems.com/download-light-inspector/ Download DIALux Evo lighting design software here: www.dialux.com/en-GB/download BR Anne

Yes - needing some sort of general disclaimer - sorry! We are just measuring experts, not application experts. :-)

Thank you very much, Estêvão

Thanks, Raimar :-)

You are welcome :-)

Dear Jen John Lee. Thank you for your positive comment. In general, Viso is not in a position to give proper advise on exact doses. The 32 mJ/cm2 is meant as an example only. We are experts in measuring, but not in virology! Try looking in this open article for inspiration: iuva.org/resources/covid-19/SARS%20CoV2%20Dose%20Response%20White%20Paper.pdf Best wishes Anne

Hi Ganpatdancharan. Thank you very much for your interest. Please send an email to [email protected] or contact of our local distributors - see overview in www.visosystems.com/contact-us/ Best wishes/Anne

Sorry, the app does not exist anymore. You can read more here: www.visosystems.com/products/flicker-tester/

The main difference is that a photometer just measures the amount of visual light as a lump sum, whereas a spectrometer measures the full spectral distribution. This means that with a photometer-based system you will just get a lumen package and a 3D light distribution, where a spectrometer-based unit will provide you with all colour details as well: CRI, CCT, SDCM etc.). Hence, you will not need an integrating sphere but will get all data in one go. You may read a little more here: www.visosystems.com/photometry/ and here: www.visosystems.com/integrating-sphere/

The full software is free and can be downloaded from our website www.visosystems.com/download-light-inspector/ The software is designed to operate Viso light measurement systems and digesting test results.

You need the new UV LabSensor model 2 which has a new spectrometer which can measure down to 200nm. So unfortunately, it is not just a software update.

Glad you liked it!

Sorry, the app does not exist anymore. You can read more here: www.visosystems.com/products/flicker-tester/ Best wishes/Anne

Sorry, the app does not exist anymore. You can read more here: www.visosystems.com/products/flicker-tester/ Best wishes/Anne

Thank you very much for your interest. Please send an email to [email protected] or contact of our local distributors - see overview in www.visosystems.com/contact-us/ Best wishes/Anne

Hi - that is somewhat tricky for all suppliers of flicker testers as no internationally recognized flicker calibration light sources exists. Viso supports a research project with prominent university parcipants that will start up soon - but that will not help in getting standards any time soon. In Viso Systems, we test against a special flickering light source that we know has a well-defined output in terms of flicker frequency and modulation pattern. Later this year, Viso will launch a special light source system designed for such a flickering output. The target audience would use it for research, flicker demonstrations and potentially also calibration. We generally recommend recalibration of our light measurement units every year (or minimum every other year), but that doesn't really apply to flicker testers. Partly because we are not measuring absolute values of light, and partly because standards are missing. Feel free to contact [email protected] if you would like more information.

No, daylight is flicker-free. Does something said in the video imply this?

Unfortunately, that's the only way it can work when using smart phone camera.

Sorry we have been so slow with this, but we actually have a beta version in the Play Store you can try out. It's only tested on few models so far, so we cannot guarantee anything. You are of course welcome to report back on your experience and on what model. [email protected]

Unfortunately the project is still not finished and has been delayed due to some partners in the project has updated their equipment and wanted to redo the measurements.

If you are competent enough you can change the ballast inside the fluorescent lamp to a high frequency version. They run at 50,000hz which is better than many LED counterparts.

I can't see anything above 100HZ doing much of anything to epileptics or anyone else. The brain cells and photoreceptors just don't recognize or process speeds that high. I would seriously consider looking at CBD or cannabinoid oil as a treatment strategy.

@@kanealson5200 actually they do. It goes up into thousands of herz but using other mechanisms

Try recording a very bright light and then playing back the video on the TV.

The higher the flicker percent, the more headache, dizziness, discomfort and eyestrain you get. You can expose yourself permanently to flickering up to 12%, temporarily (few hours) up to 25% and shortly (few minutes) up to 50%. After that, you will get mentioned symptoms. Some people are more sensitive than others though, therefor the intensity & amount of mentioned symptons can differ.

Actually the lower the flicker rate the worse it seems to be. The lower HZ will produce the on/off visible frequencies that are somewhat detectable by the human eye. The HZ that seem to be worse are those between 30HZ and less. At 20HZ it appears strobing like a strobe light. 40HZ seems to have healing effects on the cells of the body and are good for the eyes and brain. This is being demonstrated in experiments on people with dementia, specifically alzheimer's and has been shown to shrink and decrease amyloid plaques in the brain. This only happens at 40HZ however. The higher frequencies at 80HZ and above appear seamless to the eye. Remember that most movies are shot at 30FPS so that virtually every movie is ( sort of ) flickering at 30HZ. Light bulbs ( flourescent/LED etc ) generally flicker at 100HZ and above. When lights cycle at 120HZ and above there seems to be no interference. Now, radio and wifi signals oscillate too and are much higher frequencies. Who knows what those do? That;s still being debated and no one knows for certain, yet.

interesting, 30fps looks terrible compared to 60fps. incardasant bulbs also flicker at 60Hz, maybe its not a beag deal since Tesla invented AC.

Casper Gammel Too bad. :-(

Oluf Lorenzen Yeah that really sucks.

Hi Zeneb, yes you right the light distribution is only measured in one plane, and that does give a bit higher lumen inaccuracy on some type of fixtures as the light source should be rotational symmetrical. LED fixtures especially are quite symmetrical where you can expect accuracy about the same as an integration sphere +/- 4%. You can read more about the accuracy for different type of light sources here www.visosystems.com/lightspion-lumen-accuracy-detailed-description/ Please let us know of any other questions you might have.