Recent content by Anders Hoveland

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  1. Anders Hoveland

    Viribright LED bulb - looking inside

    https://www.youtube.com/watch?v=lHD657EGoCY The insides of a Viribright 8W LED bulb, note the heat sink. It is not a piece of thin aluminum, it is solid/heavy like the heat sinks used in car electronic fan speed controllers. Between the upper heat sink and the lower heat sink there are solid...
  2. Anders Hoveland

    Is violet really the best way to go?

    Is violet really the best way to go? http://www.ledinside.com/news/2015/8/purple_leds_to_replace_blue_leds “It is only a matter of time before white LEDs using blue LED chips will disappear from the market”, said Shuji Nakamura at a forum on GaN technology in July organized by Nikkei Asian...
  3. Anders Hoveland

    Red-Orange vs Red Through Red Filter

    The simple answer to your question is it would basically be the same if there was no filter at all. Both the red and red-orange will pass through the filter. If you use a red-orange LED behind a red filter, the light will most likely still be red-orange, more orangish than if an incandescent...
  4. Anders Hoveland

    GE Reveal A19 LEDs - two different versions?

    I suspect the latest version of the Reveal LED bulb no longer uses a blue filter coating, they may simply be using slightly higher CRI emitters. It might be informative to see a spectral graph of the newest versions of GE Reveal and Cree TW bulbs, the ones that do not have a bluish-tinted bulb...
  5. Anders Hoveland

    GE Reveal A19 LEDs - two different versions?

    With GE marketing "Reveal" versions of both CFL and LED bulbs, I fear the Reveal® brand mark will essentially cease to lose all meaning. How exactly is a "Reveal" CFL or LED like the old incandescent Reveal bulbs??
  6. Anders Hoveland

    Looking For A Desk Lamp: LED, Fluorescent Or Incandescent?

    It is a bit complicated. I generally think incandescent has the best quality of light for reading or fine precision working with parts. However, in some situations incandescent can put out more heat than is desirable, and the bulbs also do not last as long, especially if the lamps are always...
  7. Anders Hoveland

    Looking For A Desk Lamp: LED, Fluorescent Or Incandescent?

    Getting off-topic, but these Soraa "Vivid" bulbs use violet-emitter LEDs, yes? If so, I would imagine that they would have somewhat different color rendering properties than regular (blue-emitter) 95 CRI LEDs. Using a violet wavelength diode lowers the efficiency, so I believe to try to...
  8. Anders Hoveland

    is it ok to mount LEDs directly on aluminium heat sink without star heat sink board

    In my experience, it can work but is much trouble. And then some of the emitters do not get connected properly, and then you either have to start all over again, or some of the emitters are ruined (maybe as many as 1 out of 4). The resulting connections are also not as durable/resilient, and the...
  9. Anders Hoveland

    why is this not as bright.

    Wow, that is a BIG bulb. 150 Watt equivalent :huh:
  10. Anders Hoveland

    Halogen lighting for Bartop

    Yes, something around 93 CRI would be fine. For LED lighting, between 85-90 CRI wood tones will look about the same as they do under fluorescent light, in my experience. Not noticeably bad, but it could be better.
  11. Anders Hoveland

    problems encountered trying to make a DIY super high CRI array

    Re: Oslon color tool Actually a phosphor-converted blue LED could be important for colored stage spotlights and nightclub lighting. I have noticed that all the other colored LED spotlights look just fine, but the light from the blue colored ones has a very different feel from the old blue...
  12. Anders Hoveland

    Which driver to use?

    The only thing basic DIYers need to understand is that the driver needs to supply the right amount of current (not more than it can handle), and the voltage should not be too much higher than what they need either. The amount of current the LED was designed for can easily be calculated by taking...
  13. Anders Hoveland

    How does the Philips basic bulb diffuser work?

    I tested an LED globe bulb, where the diffuser width was substantially wider than the base width, and the light was still very directional. It really depends on the diffuser. These Philips basic bulbs are not directional at all.
  14. Anders Hoveland

    Halogen lighting for Bartop

    You need to use high CRI LED lighting (preferably something with a CRI around 95). Normal LED light does not have much red wavelengths in its spectrum, as a result wood tones look terrible, they look dull and yellowish.
  15. Anders Hoveland

    How does the Philips basic bulb diffuser work?

    It was diffuse in a completely different way. With lightly frosted glass, you can still see the area where the light is coming from inside the bulb, but despite this the light still feels very diffuse. With most common plastic LED diffusers, it obstructs the source of the light much more, but...
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