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Thread: Woods glass filter for UV light.

  1. #1

    Default Woods glass filter for UV light.

    Today I finally got my wood's glass filters. As people here with 365nm led experience know the led's themselves emit a small amount of whitish light. This tends to obscure some of the fluorescing effect of the led. Well after going to a local stained glass place and having them cut out a glass circle from the 2"x2" piece, I have to say it vastly improves the quality of the UV light output.

    From my driver's license to the colored stripes glowing on various denominations of dollar bills, the contrast is greatly improved. For anyone with a 365nm UV light I highly recommend getting a wood's glass filter made.

  2. #2
    Flashaholic* Cataract's Avatar
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    Default Re: Woods glass filter for UV light.

    Very interesting, thanks for sharing. I will soon order my first 365nm light and will test the visible light output to see how much comes out of it.
    Cataract,

    Shiny things specialist.

  3. #3
    *Flashaholic* PhotonWrangler's Avatar
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    Default Re: Woods glass filter for UV light.

    Did you get the Rosco 2x2" filter?

  4. #4
    *Flashaholic* PhotonWrangler's Avatar
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    Default Re: Woods glass filter for UV light.

    I just got one of the Rosco 2" x 2" filters. Even though the website said it was Woods Glass, and so does the packaging t hat it came in, it's actually a dichroic filter and has a silver mirrored appearance.

    I'm wondering if I can cut this type of filter to shape with conventional glass cutting techniques without disturbing the properties of the filter.

  5. #5
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    Default Cutting Dichroic "Wood's Glass" from Rosco

    Quote Originally Posted by PhotonWrangler View Post
    I just got one of the Rosco 2" x 2" filters. Even though the website said it was Woods Glass, and so does the packaging t hat it came in, it's actually a dichroic filter and has a silver mirrored appearance.

    I'm wondering if I can cut this type of filter to shape with conventional glass cutting techniques without disturbing the properties of the filter.
    Yes, I purchased one of the 2"x2" filters just last week from B&H and using an ordinary hand cutter, I scored it and broke it easily. You can just barely see your score mark because it is like a front surface mirror on both sides, but it cuts like ordinary glass, not plate or pyrex. I made two clean cuts with NO problem at all, and used my Wizling grinder to prepare a 1" diameter blank to replace the clear lens in my UV LED flashlight. It works wonderfully. I have tried working with the glass from fluorescent BLB bulbs without much luck. I suppose if you broke an incancescent BLB bulb and used your nippers to get a convex piece, then took a grinder to it, you would be in luck.

    But for me, it worked out GREAT to cut up the Rosco filter and grind a circular blank!


    -- Nightcrawler

  6. #6
    Flashaholic* FRITZHID's Avatar
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    Default Re: Cutting Dichroic "Wood's Glass" from Rosco

    ok, well i've been looking for as cheap as possible woods glass and have come to no avail unless i get it from china, and they want a fortune for what i need. it needs to be 4" dia for my spotlight, anyone here know where i can find such a piece?
    if your not wearing a #12 welding screen than it ain't bright enough! "Hand-Sun H.I.D." 55w & 75w(for sale), Rocky 3w LED, Stanley 109 35w mod'd, Maxa-Beam Gen II, 55w hid/100w incan Vector Twin, 400w MH long arc, 100w MH mid arc. Amondotech n30.

  7. #7
    *Flashaholic* PhotonWrangler's Avatar
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    Default Re: Cutting Dichroic "Wood's Glass" from Rosco

    Quote Originally Posted by Nighcrawler View Post
    Yes, I purchased one of the 2"x2" filters just last week from B&H and using an ordinary hand cutter, I scored it and broke it easily. You can just barely see your score mark because it is like a front surface mirror on both sides, but it cuts like ordinary glass, not plate or pyrex. I made two clean cuts with NO problem at all, and used my Wizling grinder to prepare a 1" diameter blank to replace the clear lens in my UV LED flashlight. It works wonderfully. I have tried working with the glass from fluorescent BLB bulbs without much luck. I suppose if you broke an incancescent BLB bulb and used your nippers to get a convex piece, then took a grinder to it, you would be in luck.

    But for me, it worked out GREAT to cut up the Rosco filter and grind a circular blank!


    -- Nightcrawler
    Nightcrawler, thank you for this information. I have a regular glass cutter so I will try this. The dual-sided evaporated coating was scaring me off but if you've had good success with this technique I will try it also.

  8. #8
    *Flashaholic* PhotonWrangler's Avatar
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    Default Re: Cutting Dichroic "Wood's Glass" from Rosco

    Here's one way to get a good quality woods glass filter - buy a used Blak-Ray B100 fixture.
    Last edited by PhotonWrangler; 03-07-2012 at 05:16 PM.

  9. #9
    Flashaholic* hank's Avatar
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    Default Re: Woods glass filter for UV light.

    I just got a Solarforce UV dropin, and have the same question -- is cutting down a larger Wood's Glass filter still the only good way to filter out the visible part of the spectrum, for a regular flashlight?

  10. #10
    Flashaholic* hank's Avatar
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    Default Re: Woods glass filter for UV light.

    Quote Originally Posted by hank View Post
    I just got a Solarforce UV dropin, and have the same question -- is cutting down a larger Wood's Glass filter still the only good way to filter out the visible part of the spectrum, for a regular flashlight?

    EDIT: this looks partway toward what I want, in a filter gel: http://www.rosco.com/CFFileServlet/_...3413912437.PNG
    That's Permacolor P4200 Deep Purple
    Transmission: 89%

    found using their graphic search tool: http://www.rosco.com/mycolor/mycolor.cfm

  11. #11
    *Flashaholic* PhotonWrangler's Avatar
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    Default Re: Woods glass filter for UV light.

    If it's an LED drop-in, you can try some gel filters. Here's a site that recommends a combination of Rosco R383 Congo Blue and R375 Cerulean Blue. Look up a theatrical lighting supply shop and obtain a RoscoGel sample swatch book to test it.

  12. #12
    Flashaholic* FRITZHID's Avatar
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    Default Re: Woods glass filter for UV light.

    If it's an LED light already, and you arn't planning on using it for anything else, I'd go with an LED drop in rather than filter.
    UV incan is virtually useless.
    UV hid is awesome but need a thick filter to withstand the heat. I use the filter from a magnaflux lamp on my maxabeam, but it's a little thick to try and cut.
    I've found high power UV leds to be quite impressive!
    if your not wearing a #12 welding screen than it ain't bright enough! "Hand-Sun H.I.D." 55w & 75w(for sale), Rocky 3w LED, Stanley 109 35w mod'd, Maxa-Beam Gen II, 55w hid/100w incan Vector Twin, 400w MH long arc, 100w MH mid arc. Amondotech n30.

  13. #13

    Default Re: Woods glass filter for UV light.

    Eagletac has a 365nm drop in for the T20C2. I really like mine.

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