Will Jacobs Posted April 24, 2020 Share Posted April 24, 2020 I'm determining whether or not I could make an LED light bank for a project out of these shop lights: https://www.amazon.com/Barrina-8500LM-Daylight-Output-Linkable/dp/B07Q49DNGS/ref=sr_1_8?dchild=1&keywords=led%2Bshop%2Blight%2B5000k&qid=1587769697&sr=8-8&th=1 When shooting with 16mm film at 24 fps at 60 Hz, will there be any flickering? Even if I utilize typical LED video lights? Link to comment Share on other sites More sharing options...
Will Jacobs Posted April 25, 2020 Author Share Posted April 25, 2020 It appears that flickering will not be an issue after viewing this video: Link to comment Share on other sites More sharing options...
Premium Member Phil Rhodes Posted April 25, 2020 Premium Member Share Posted April 25, 2020 It depends entirely on the specific type of shop light you get, and how those specific lights were designed. It's true that domestic LED lighting is getting steadily better and better; some of it could be used quite effectively. You have two concerns (other than brightness and directionality, depending on what you're trying to achieve.) The very lowest cost stuff, which frankly might include some work lights, may flicker at mains frequency or at some other frequency based on the designer's whim. Also, the colour performance may be a bit off, and the danger with this is that it may look okay on some things - even skin tones - and then give you a nasty surprise on some other subject, later on. This is the aspect that has really improved recently - it's now possible to get domestic lighting with reasonable colour performance - but the majority of it is still pretty bad. You can only really determine either of these things by testing on colour charts, with various real-world colours, and at various frame rates. Try it. In the worst case you'll end up with a light that you can use to create cool blue moon backlights for night shoots. A minority of lights may flicker or produce banding on rolling shutter artifacts at any useful frame rate, but that's fairly rare. P Link to comment Share on other sites More sharing options...
Will Jacobs Posted May 5, 2020 Author Share Posted May 5, 2020 Phil, I recently tested the lights with my digital camera and noticed barring at 24 fps. I have since returned them. It was enough to have me avoid finding cheap alternatives altogether and invest in what works and lasts. Thank you for your insightful response! Link to comment Share on other sites More sharing options...
Premium Member David Mullen ASC Posted May 5, 2020 Premium Member Share Posted May 5, 2020 If it's like a 60Hz roll bar, then try shooting at 1/60th. Link to comment Share on other sites More sharing options...
Carl Craver Posted September 18, 2020 Share Posted September 18, 2020 Hi, I've written an iPhone app that can measure light frequency directly called FlickerFinder. Essentially you point the phone towards the light, it will autoexpose to reveal and measure the flicker, then give you a suggested shutter speed. It's in the final stages, I just need some help calibrating the rest of the iPhones. https://flickerfinder.com Alternatively if you know the frequency you can use a calculator app https://apps.apple.com/app/id1514983816 I hope it helps, I can answer any questions. Link to comment Share on other sites More sharing options...
Tanul Dilwali Posted September 24, 2020 Share Posted September 24, 2020 (edited) On 5/5/2020 at 9:17 PM, David Mullen ASC said: If it's like a 60Hz roll bar, then try shooting at 1/60th. absolutely - in other words, changing the shutter angle to eliminate the roll bar, and re-expose accordingly. Of course, in a shop, various lights may have different operating frequencies and you may see flickers and banding across a huge range of speeds Edited September 24, 2020 by Tanul Dilwali addition Link to comment Share on other sites More sharing options...
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