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Good to hear clarification by someone on the fact that UGR is only specific under the specified room conditions and can only really be established at the design stage.
When an A rated lamp is now rated as 210 lumens/watt or higher, and 111 would give this fixture a rating of "E" I'd certainly not be calling it "incredibly efficient" as you do in this video. Commercial installations where there are potentially hundreds of this kind of fitting being installed, being used for many hours a day is exactly the area where we need manufacturers to put in some effort and produce genuinely high efficiency fixtures.
Sorry Joe way to technical. Think photography/ videotography the studio light you’re standing in front of can be controlled in a number of ways, but first a rule of thumb the closer the light source the brighter the light and the more powerful the light. Your studio light should be balanced so each light give the same amount of light or maybe balanced with daylight but generally the the lights have soft boxes on them theses will 1)weaken the light making it softer 2) soften and fill in harsh shadows, 3 different attachments can be used to give highlights or to direct light light , attachments like snoots, honeycomb , barn doors umbrellas colour jells . Put simply move the light forward gives brighter harsher light move them further back gives less light and heavier shadows hence why we use soft box’s . In every day lighting in places like supermarkets and factories the higher the lights are the less light ie power and uneven spread of light, the lower the light are the more light and harsher but the more even speed of light . Great video though as always .
