Plexiglass front cover?- Mtbr.com
Results 1 to 10 of 10
  1. #1
    mtbr member
    Reputation: robtarr's Avatar
    Join Date
    Aug 2009
    Posts
    20

    Plexiglass front cover?

    I am finishing up building my first light. It is basically the same design as achesalot's triple cree light, but my optics are round, not square. My question is, does anybody have any suggestions for something to cover the front to protect the optics from the elements?

    thanks,
    Rob

  2. #2
    mtbr member
    Reputation:
    Join Date
    Sep 2006
    Posts
    251
    You will loose quite a lot of light when you'd would use plexiglass. Coated glass would be a better solution, it will only be hard (harder than plexiglass) to find in the right dimensions.

  3. #3
    mtbr member
    Reputation:
    Join Date
    Oct 2008
    Posts
    1,322
    Use the plexi and you will be fine.
    Plexi has a higher abberation value than glass so there is some distortion of the light.
    Minimal when considering it is for a bike light and not the optics in a telescope.
    Same holds true for anti-reflective coatings. Minimal loss in bike systems.
    Anti-reflective coatings increase light transmission by a few percentage points due to decrease internal reflection. No so much that anyone would notice with a projected light.
    Plexi is cheap and easy to work with.
    Unless there is a drop in glass lens for you light I would stick with plexi. Most hardware stores sell it in small sheets. Score it with a razor knife and snap the plexi.
    Last edited by odtexas; 09-02-2009 at 08:16 AM.

  4. #4
    mtbr member
    Reputation: zen bicycle's Avatar
    Join Date
    Mar 2007
    Posts
    463
    1/8 or 1/16 polycarbonate (lexan)
    Look at www.smallparts.com

    http://www.smallparts.com/Clear-Poly...AF&pf_rd_t=101

    Can cut it with scissors and as long as it sits flush against the optics very little loss.

  5. #5
    mtbr member
    Reputation: HEY HEY ITS HENDO's Avatar
    Join Date
    Feb 2008
    Posts
    716
    welders head mask clear protective lens, about 4" x 3" x 1/8"
    unbreakable, (lexan?) so you can easily cut/shape to what you need
    ...Scun.thorpe, UK

  6. #6
    mtbr member
    Reputation: bumphumper's Avatar
    Join Date
    Jan 2009
    Posts
    136
    I've found that plexi scratches easily, but it is cheap and easy to replace.

    Recently I have used dismantled clear glass camera 'filters' intended for camcorders, they seem to start at about 1" upwards...also cheap at my local secondhand camera shop.

  7. #7
    mtbr member
    Reputation: zen bicycle's Avatar
    Join Date
    Mar 2007
    Posts
    463
    There is a big difference between Plexi and poly. Plexi will scratch easily. Polycarbonate not so much.

  8. #8
    Carbon8er
    Reputation: El34's Avatar
    Join Date
    Jan 2009
    Posts
    1,404
    I bought a 3 x 3 square foot of Lexan (polycarb) at Lowes
    It's over with the house replacement glass

    They have small pieces also, like 5x7, 8x10, etc

    poly carb rules, I love it.

  9. #9
    At Work
    Reputation: sxr-racer's Avatar
    Join Date
    Nov 2005
    Posts
    1,770
    I dont run any on mine. No issues yet. 2nd season.

  10. #10
    mtbr member
    Reputation:
    Join Date
    Sep 2007
    Posts
    759
    I have to ditto the welders mask cover sheet. They come in small or large rectangles and are poly carbonate and nice and thin so the light gets through well. They are also very cheap. I payed around $2 dollars for mine.

Members who have read this thread: 0

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •  

THE SITE

ABOUT MTBR

VISIT US AT

© Copyright 2020 VerticalScope Inc. All rights reserved.