Just depends on how accurate you need the color to be. High CRI tubes way up there in the CRI 98 5000K range are pricey and hard to find. Then you need exactly the right kind of diffusion plastic and even a special reflectance paint inside the box. VERY few commercial units actually live up to that full set of standards. But if that kind of critical accuracy is not a priority, and you just want to casually examine your film, it's pretty darn easy to make these things or buy them any number of places, or
get them downright free from some old graphics firm or print shop shutting down.
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