Best red lense material ive found.

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And they are red like lenses should be.
You can cut these and put them between the bulb,and clear lense.
They will take 1 million candle power heat.They are made for in front of dj spotlights.
Which get very hot.
This is just a site i found them on to show fellows.
If it isnt allowed moderators please remove.But its thwe only site that shows them good.

http://cgi.ebay.com/American-DJ-Gel-Pack-Z-PROGEL-SH-Pink_W0QQitemZ160151902301QQcmdZViewItem