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Best red screen material - and where to get it


Tonk

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Hi, I'm looking for a transparent red sheet material that can be easily cut that can be put to a variety of uses on my telescope rig. Any suggestions and links to where I can get the stuff? TIA.

a ) Covering lap top screens
b ) Covering some digital readout panels (I have a couple of DROK DC-DC converters on the rig to regulate to 12v (from 14v) and to read out voltage and current - its white LED driven and too bright  :( )

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You might look at red filters for stage lighting (theatres, concerts etc.), Lee in the UK do virtually every colour under the sun, incuding red, as about 5-6 pounds for a 530 x 1200mm sheet. Some might be too dark (transmission is normally between 13 and 18%), but you should get something that will work. For example: http://www.stage-electrics.co.uk/shop/sales/lighting/colour-filter-and-gel/sheets---lee-led-colour/product.aspx?code=564-3817&nr=true  and http://www.leefilters.com/lighting/led-02.html

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12 minutes ago, Putaendo Patrick said:

You might look at red filters for stage lighting (theatres, concerts etc.), Lee in the UK do virtually every colour under the sun, incuding red, as about 5-6 pounds for a 530 x 1200mm sheet. Some might be too dark (transmission is normally between 13 and 18%), but you should get something that will work. For example: http://www.stage-electrics.co.uk/shop/sales/lighting/colour-filter-and-gel/sheets---lee-led-colour/product.aspx?code=564-3817&nr=true  and http://www.leefilters.com/lighting/led-02.html

The 'Plasma Red' filter colour is particularly good because it is very deep red, and hence is less likely to suppress Rhodopsin production in the eye.

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Primary red film made by Colourlite is very good.  Here is the transmission graph: http://www.colourlite.com/transgraph.aspx?FilterNumber=106

106 is the number that goes with this colour.

It may be possible to get it from Amazon.  The supplier name I used shows it no longer available but this page:

https://www.amazon.co.uk/Gel-Sheet-Primary-Red-106/dp/B000KHBTYE/ref=aag_m_pw_dp?ie=UTF8&m=A2XXCIDKOP8CGQ

shows it as available.

 

In case the link does not work, it is described as: "Gel Sheet Primary Red 106, Primary red" by Electrovision

They also do a colour called Flame Red (164) which, judging from the transmission graph, is not as good for astronomy than 106 but better than nothing.

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Two other points that come to mind:

1. The 106 film mentioned in my last comment  is thin enough that you can operate an iPad touch screen through it

2. If you try to redden a white LED it does not work all that well because they don't emit much deep-red light.  The light does become red, but still more orange-red than you would wish.  A lot better than nothing though.

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The 106 film that's used for stage lighting sounds like the stuff I have.

the thing about this is that it will block the green and blue light from your screen, so if you don't have a monochrome mode available things might appear to go missing.

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