Recent content by JoakimFlorence

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  1. J

    Review of Sylvania TruWave light (new broadband blue emitter technology)

    It's possible the 2700K might have adjusted the wavelengths to have more 470nm and less 450 and 440, trying to more accurately reflect the spectral distribution of an ideal blackbody radiator. I only have the 3500K version, I have not observed the 2700K. I'm thinking that could be a possible...
  2. J

    High Pressure Sodium

    I'm not sure and may be wrong, but it might have to do with a negative feedback phenomena. If the bulb becomes too hot and too much of the liquid mercury vaporises, the gas pressure inside will increase to a point where the current voltage level can no longer maintain an arc. This is the same...
  3. J

    Inside low-cost LED ac bulbs

    You can ask anyone in the United States if they are seeing 100 Watt equivalents being sold in retail stores for under 4.50 U.S. dollars (6 Canadian dollars). (Especially one that actually puts out a full 1600 lumens @ 2700K)
  4. J

    Inside low-cost LED ac bulbs

    Of course, at $2.00 it's very likely the government is subsidizing the cost of these bulbs. The free market price at this time would probably be more like $10 to $12 (if purchased individually from a retailer). So we can assume the taxpayer (you) is paying the difference. (There are indeed...
  5. J

    Inside low-cost LED ac bulbs

    To be totally fair, that's not really "real" RGB. The R and G in those designs are phosphor covered emitters. So the resulting spectral output of all three combined is probably very similar to a white LED. Might even expect the CRI to be even a little higher than a normal white LED, since the...
  6. J

    Smart lightbulb LED runs at 37 volts?

    What exactly was flashing? One of the LEDs or all of them? The interesting thing about constant current drivers is that, when a long string of many LEDs is being powered, you can often remove one and all of them will continue to work just fine. Constant current power supplies will adjust the...
  7. J

    Review of Sylvania TruWave light (new broadband blue emitter technology)

    To me, this TruWave seems about exactly equal to other 90 CRI LED bulbs when it comes to "warmth" of wood and skin tones, and color contrast between reds and greens. Although I do have to say that 3500 or 4000K is a good color temperature to bring out red and green contrast, so that might be a...
  8. J

    Review of Sylvania TruWave light (new broadband blue emitter technology)

    Yes, this 3500K almost sort of feels like 4000K light, but ever so imperceptibly just a little on the warmer side rather than on the slightly colder side. It feels pretty close to "neutral white" to me, especially at lower lighting levels. It almost sort of feels like the very upper range of...
  9. J

    Review of Sylvania TruWave light (new broadband blue emitter technology)

    Sylvania TruWave "bright white" (3500K) White LED light usually has a narrow wavelength of blue. In a spectral graph, this typically shows up as a tall spike of blue at about 450nm. This defines the character of typical LED, preventing the light from feeling as "natural" as some other light...
  10. J

    LED bulbs with selectable color temp

    I had an idea how this 5-way color temperature light might work. I'm sure this is not how it actually works but I thought I'd share the idea I came up with. There would be 3 different types of emitters; 2700K, 3500K, and 5000K. Each of the levels would be divided, in a 5/8 to 3/8 ratio, or...
  11. J

    Jeers to Bell and Howell for garage ceiling light

    In my experience, garage LED lighting seems to have a higher rate of failure due to constant vibration. So it is very possible the vibration could be a factor in prematurely short lifespan. In other words, it simply was not really designed the best. The same is true for incandescent and halogen...
  12. J

    LED bulbs with selectable color temp

    I presume by that that you mean it is much more preferable to have all the bulbs be 3000K, 3500K, or 4000K, rather than using a combination of 2700K and 5000K bulbs together because you find the light color of one too orange and the light color of the other too bluish. Another problem, which...
  13. J

    LED bulbs with selectable color temp

    Those options to be able to change color temperature and color come with some subtle disadvantages, and even some limitations, which most people do not realise, and probably do not care about. There are some trade-offs. As I pointed out, these bulbs seem to have flicker, and then there is very...
  14. J

    LED bulbs with selectable color temp

    Those Ecosmart adjustable color temperature bulbs appear to have to have flicker. It's only very slight at 5000K, almost totally unnoticeable at 2700K, but gets much more noticeable at intermediate temperatures like 3500K and 4000K. At 3000K the flicker is not really too bad but is a little...
  15. J

    Review of light quality from 98 CRI Chinese brand

    Totally off topic but I have some data about that which may be of interest you. RGB can only attain a CRI value of 67-81, although RGBA can technically achieve a CRI up to 92. Theoretical limit for the efficacy of red, green, blue and white LEDs The CRI values in this case are not really the...
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