Reddening interior lights for astronomy outings?

I picked one up at Walmart a couple of days ago. It's sufficiently bright when turned all the way up for white light and the red light is sufficiently subdued.

Thanks for all the responses, all.

I don't have pictures with me, but I used the Theatrical Lighting Gel Sheets and they work marvelously.
The sheets come large enough where you can simply layer more than one sheet atop each other to get the density wanted.
I believe I purchased the Deep Salmon, but the choice is up to you:
http://www.stagelightingstore.com/Stage-Lighting-Store/Theatrical-Gel-Sheets-Reds-Pinks

Originally posted by jstrenn How about something like this: http://www.walmart.com/ip/Generic-20147-Bushnell-TRKR-1000-Lumen-Lantern/42441354 It has a red light "night vision" feature.  May be a better option than permanently coloring your lenses in the pod.

Nice find! It's exactly what I was looking for.

Maybe paint this on the inside or outside of the light lens: http://www.amazon.com/Krylon-Stained-Glass-Paints-Aerosol/dp/B000QD9NYA

how about anticipating your gaze approx 45 minutes ahead of time and turn all the pod lights off?  hogone