Oh I love that 70s TV hit! I've been by the hospital and the firehouse that were featured in the show. Filmed back when the LA area had endless strings of incandescent and mercury vapor lights at night!
Are you sure, they are self ballasted? I see them first bluish and then shifting to white, what belong more to "normal" MV.
On SBMV i would expect the opposite: First yellowish (only the incandescent ballast emit significant light) and then, when the arctube warm up, the color would shift to white.
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On SBMV i would expect the opposite: First yellowish (only the incandescent ballast emit significant light) and then, when the arctube warm up, the color would shift to white.