Bingo!
Tim I am happy to report that your theory doesn't apply to light bulb manufacturers. I just received the bulbs I ordered on Friday. The name on the bulbs is Lumichrome made by Lumiram. They are spectacular. In comparison Ott lights are too green and Ott true color are too yellow. They are not precisely the same as true north light but are so close that the difference is negligible, to my eye anyway.
In addition I've never seen any lights that are better.
Here is the description from their site:
Lumichrome
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