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Window transmission

Discussion in 'Ask Jack' started by brookway17, Feb 10, 2019.

  1. brookway17

    brookway17 Silver

    In a video you had posted on your Facebook page you were talking about the transmission of sunlight through I believe a window in your new clinic. You said that you had measured adsorption in the red band. I spent a lot of time dealing with glass back in the late 70s when I was trying to encapsulate photovoltaic cells. I remember that the glass manufacturers went to great lengths to ensure a fairly flat transmission curve in the visible portion of the solar spectrum.
    I was wondering if the window that you had measured had a low E Coating to enhance Thermal performance. These coating’s usually reflect radiation in the infrared range. As is usual for optical coatings there is some bleed into adjacent wavelengths, in this case the red. It is ironic that yet again another energy conserving technology results in a red light hazard.
  2. Jack Kruse

    Jack Kruse Administrator

    No they did not according to the scope. Spectroscopes show you just how effective manufacturing of glass really is.
  3. Jamie Ward

    Jamie Ward Gold

    Personally, I think the tied has turned on shielding EMR vs allowing unfiltered natural light through in the building... A compromise would be to have unfiltered glass that transmits as much light as possible (including EMR) and then having a shielding material in your curtains so at night you can block out the EMR at least when you sleep.
  4. brookway17

    brookway17 Silver

    Most standard window glass looks green when viewed from the edge. This is probably why the transmission of the red wavelegnths is reduced. ANother type of glass that appears clear when viewed from the edge is
    Water White glass (aka Low iron glass).This glass is said to have a very flat transmission curve. This glass is used in architectural applications such as museums. Sounds like this would be the Optimal glass for all windows. Unfortunately it does cost more. Looks like for now I will have to wear my blue blocking gogglesWhen I am indoors during the day ,I already wear them in the evening
  5. Jamie Ward

    Jamie Ward Gold

    It likely still blocks UV as any FYI as museums care about protecting their art. It will also be highly penetrable to EMFs
  6. brookway17

    brookway17 Silver

    Yes, it will definitely block a lot of UV. I was only concerned with it blocking red and becoming a blue light hazard. You should be outside as much as possible

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