Revo Prefect - 80 Watt MB/U

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This video features a Revo Prefect street lighting lantern running a vintage Atlas 80 W MB/U (mercury vapour) lamp with a pearl (as opposed to phosphor) outer coating.
See also:
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[@DaveBeaven-tx2tp]

MBFUs normally start pinky before turning cool white on warm up. Not sure why this is blue? This Prefect has the later Relite Electric Ltd refractor fitted.
Can anyone hear the pigeon in the background?

[@StreetLightOnline]

It's an uncoated lamp with only a pearl finish to the outer bulb - the same effect was applied later to Thorn's 70 W SON-Es.