All the LED bulbs have more stable colour than Halogen.All the Philips ExpertColor 5.5W bulbs I tested have significantly less flicker than Halogen.You haven’t by any chance got a sample of both that could be sent to Big Clive? He often reviews the circuitry of quite a lot of cheaper LEDs (but doesn’t look into the spectrum output). It would be interesting to see a teardown of the two. Did you buy them at the same time? Perhaps the 25deg are a slightly newer improved design? Really weird that the different angles have different internals though. It’s good to hear that those are at least half decent flicker wise as that makes them an even more attractive proposition, especially at that price point. I’d have expected the electronic design to be identical, certainly for 4000K 36 degree. These do have easily detectable changes in output power & spectrum (worse for 3000K). The really weird thing is that I’ve also tried Philips ExpertColor 4000K & 3000K 5.5W 36 degree GU10. This is all at 240V AC, 50Hz, no dimming. I've tried a few of these, and while I can see small changes in spectrum, they're much more stable than halogen GU10s! * RawDigger helps determine the idiosyncrasies of both camera and raw convertor by providing a true view into the raw data and comparing it to the results obtained through raw conversion.The best GU10 I've found so far ar Philips ExpertColor 4000K 5.5W 25 degree GU10. * RawDigger can be used to check the amount of vignetting caused by the lens and the sensor. * Landscape photographers may want to use RawDigger to determine the effect of the filters on the lens, to check neutrality of polarizing and neutral density filters and, possibly, to select color correction and color compensation filters to use in different light. * For studio photography RawDigger helps establishing the proper light filtration to achieve the cleanest possible shadows on the shots. * RawDigger is more precise than any exposure meter for the purpose of evaluation of the uniformity of fill light and reproduction light setups (in terms of the evenness of both color balance and luminosity across the background). * RawDigger is a useful tool for examining how the relative per-channel underexposure depends on the color of light. * If the shadows look blotchy, colorless, or details in shadows are poorly resolved you will be able to determine how much they are underexposed and set Underexposure (UE) indicator in RawDigger accordingly. * RawDigger helps determining the raw level at which the overexposure "blinkies" start on the camera LCD and to know how much headroom is still available after the blinkies start showing. ![]() * For ETTR practitioners, RawDigger makes it very simple to compare raw histogram to in-camera histogram and account for the difference, making the exposures as much "to the right" as possible. ![]() That is, RawDigger lets you establish the headroom in highlights and obtain optimal exposures. * RawDigger allows determining how exposure meter is calibrated and what raw level corresponds to the midpoint of in-camera histogram. * Overexposure (OE) indicator will show you exactly what areas of the shot are blown out and in which color channel(s) it happened (best if used in channel view). ![]() ![]() * RawDigger displays the real histogram of the raw data, which greatly differs from the in-camera histogram and histograms presented by most of the raw converters. Instead, it allows you to see the data that will be used by raw convertors. RawDigger doesn't alter the raw data in any way. In essence, it is a microscope of sorts that lets you drill down into raw data. RawDigger is a tool to visualize and examine pure raw data as the camera has recorded it.
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