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Greetings Philippe --
I don't believe it's necessary to filter your tungsten enlarger light for film testing, for two reasons: First, most films are panchromatic now, so the difference in their response to tungsten and daylight is not great. Second, unless your photography is highly specialized (nothing but studio work, for example) you'll probably encounter a wide range of ambient light color in the field—1500K sunsets to 15,000K skylight, for example. No matter what color your test illumination is it can't be optimum for all possible subject conditions. So use a filter if you want to, but I doubt that it will affect the tests' accuracy significantly.
My philosophy is "some things are worth worrying about and some are not; the trick is to determine which is which." I think the color of the testing light (within reason) is not.
Unseasonable snow and cold here, too, until last night; today it's 7°C and raining and the snow is disappearing rapidly. It's a fine day for sitting by the fire.
Happy Holiday Season!
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