Unfortunately I don't really have any way to objectively quantify that. To the naked eye it's a bright, crisp-white colour. It is one of the nicest "white" lamps I've ever used. For brightness, I'd say it's easily comparable to an Ushio on a proper ballast - but unlike an Ushio, it is a probe start lamp, so runs, and starts, perfectly on my M57 ballasts.
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-- Tony
My next hobby will be flooding my basement while repeatedly banging my head against a brick wall and tearing up $100 bills. Whee!
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