hello people i just got my banq 15" and my prototype looks sick!!!!!!😀
but i am reading alot about uv filtering and i really need help on this issue. please remember i live in u.k everything is hard to get and expensive!
i read somewhere that people were using some kind of cooking sheet or some kind of material as uv filter. i'm using a 150 4200k hqi (very bright image!) so roughly how long would it take to damage my screen with that kind of power?
also very important do ohp have uv filter built is their glass??
thank you people, any information welcome!
but i am reading alot about uv filtering and i really need help on this issue. please remember i live in u.k everything is hard to get and expensive!
i read somewhere that people were using some kind of cooking sheet or some kind of material as uv filter. i'm using a 150 4200k hqi (very bright image!) so roughly how long would it take to damage my screen with that kind of power?
also very important do ohp have uv filter built is their glass??
thank you people, any information welcome!
do people hate me or something?? not a single reply!
reminds me of that jim carrey film, "eerr, nobody wants to play with me"
reminds me of that jim carrey film, "eerr, nobody wants to play with me"
Better late than never eh?
Well I don't have anything specific to add. They were talking of using Lexan XL10 for UV filtering, but apparently you also will want an IR filter as well. (That's currently what I'm digging for) I got my UV filter from surplus shed.
Well I don't have anything specific to add. They were talking of using Lexan XL10 for UV filtering, but apparently you also will want an IR filter as well. (That's currently what I'm digging for) I got my UV filter from surplus shed.
thanx dude. but ace informed me that my bulb had uv protection built in. try finding lexan in u.k!!! nooo way!!! 
I think it was Ace that discovered that Lexan actaully did very little to protect the LCD... something to the effect of the UV coating ONLY stops the lexan from discoloring, it however does not filter or stop UV, it still passes it but the lexan with UV coating wont yellow like a normal sheet of lexan would.
who do you trust? who do you believe? the trusth is out there? the truth is in here?
confused???? now you know how i feel
Lexan blocks harmful ultraviolet (below 380nm) to a large degree as a property of the substance itself. However, it will eventually yellow and crack under UV exposure. UV-coated or stabilized Lexan has a film or additive that protects the plastic itself from degradation, and also improves UV blocking.
Lexan XL10 from Home Depot is a good DIY ultraviolet filter for an LCD projector. It will not be as good as a professional-quality UV filter, but it is 100 times better than no filter at all. The benefit-to-cost ratio makes Lexan XL10 ideal for a DIY projector. If you have cheap or free access to real UV filter material, use that instead.
Lexan XL10 from Home Depot is a good DIY ultraviolet filter for an LCD projector. It will not be as good as a professional-quality UV filter, but it is 100 times better than no filter at all. The benefit-to-cost ratio makes Lexan XL10 ideal for a DIY projector. If you have cheap or free access to real UV filter material, use that instead.
If you want to buy Lexan in the UK (I'm not convinced of it's suitability in a pj) then take a look at this site:
http://www.gcip.co.uk/EP/lexan.htm
They seem to do a variety of sizes and it has a uv coating on both sides.
http://www.gcip.co.uk/EP/lexan.htm
They seem to do a variety of sizes and it has a uv coating on both sides.
cbm5 said:
Well said 😉
But ill add onto this and say Lexan will also chew 20% of your light from the source.
Seriously, its not needed if the MH light has a UV filter built into its outer glass.
Trev🙂
Perspex sheet VA grade
Hi all, I can see that you guys are searching for a material that will stop UV light passing throught material. You've mentioned Lexan - which has UV weathering properties ie it will not degrade due to exposure to UV light. However, the material does not block UV light. If you want to block UV light you need to use a grade of PERSPEX called VA grade - this will actually stop UV light passing through the material. We can supply it in sheet form, and can cut sheets to size if required. For more info go to www.gcip.co.uk/EP/perspex.htm
If anyone need more advice, please contact us Gilbert Curry Industrial Plastics T 024 76 588 388
Hi all, I can see that you guys are searching for a material that will stop UV light passing throught material. You've mentioned Lexan - which has UV weathering properties ie it will not degrade due to exposure to UV light. However, the material does not block UV light. If you want to block UV light you need to use a grade of PERSPEX called VA grade - this will actually stop UV light passing through the material. We can supply it in sheet form, and can cut sheets to size if required. For more info go to www.gcip.co.uk/EP/perspex.htm
If anyone need more advice, please contact us Gilbert Curry Industrial Plastics T 024 76 588 388
IF you decide you want to use something other than lexan. I had some 4"x4" optical glass that filters out uv and ir very efficiently. I used it in my projecter and it doesn't make the projection any noticeable amount dimmer.
I had 10 of these filters but I used 1 for mine and the other 9 are going into kits for guys at work that I got interested in this. I can get more in a less than week or so if you are interested.
They are a bit more expensive than lexan though. It would cost you $50Cad (20 pounds?) +shipping costs, but I gaurentee you that it is much better.
Here is a link to a thread I posted about these earlier, it has a graph of how much lightt it blocks and different wavelenghts and it has a picture of the actual product.
www.diyaudio.com/forums/showthread.php?threadid=74579
I had 10 of these filters but I used 1 for mine and the other 9 are going into kits for guys at work that I got interested in this. I can get more in a less than week or so if you are interested.
They are a bit more expensive than lexan though. It would cost you $50Cad (20 pounds?) +shipping costs, but I gaurentee you that it is much better.
Here is a link to a thread I posted about these earlier, it has a graph of how much lightt it blocks and different wavelenghts and it has a picture of the actual product.
www.diyaudio.com/forums/showthread.php?threadid=74579
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