I wasn't thrilled with the "bluish" color from 2 new Velux SunTunnel skylights. I searched around a bit on the web and was able to find color filters made specifically to shift color temperature from Rosco. I wanted to go from 5500k daylight to 3000-4000k. I ordered a few filters in 1/4CTO and 1/8CTO so I could stack them and go from 1/8 to 1/2 in 1/8 increments. B&H photo (links below) had them in stock.
I ended up using a 1/8 CTO http://www.bhphotovideo.com/c/product/44204-REG/Rosco_RS340911_3409_Filter_RoscoSun.html
and a 1/4 CTO http://www.bhphotovideo.com/c/product/44204-REG/Rosco_RS340911_3409_Filter_RoscoSun.html
stacked, for about a 1500k shift.
The filters were easy to trim to size and lay on top of the diffuser.
The light is now very close to an incandescent, probably around 4000k, but isn't amber. There is some reduction in brightness, but we are in Texas, so there is plenty of light :) I was a little worried that the diffuser would look yellow on the inside, but it is so close to white that you don't notice any difference at all.
Previously people would walk in and say "wow, that is a really blue skylight", now they don't even realize it's a skylight at all, they think it's just a cieling fixture.
Here is a link that might be useful: Rosco Cinegel CTO Temperature Shift Filters
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concrete patio
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