When I observed the two Gaash Hila lanterns (Which have a new 125W MV lamps) at Shteinberg street, from the window of my room during roadlighting turning on, they glowed a pure neon red color (It is very cold here at Qiryat Ata), that I've never seen in a MV lamp with a yttrium vanadate phosphor (Yes, not magneta like most new DX MV lamps, but pure red color, not different than a red fluorescent lamp or a neon lamp).
Why this was happened?

Has nothing to do with temperature, the lamps are just brand new and the arc tube is producing very high UV, after awhile the quartz begins to slowly stop the transmission of UV and that affects the phosphor color. Thats why brand new lamps burn a very warm pink color (at full intensity) then after a few weeks to a month gradually become cool white. I have a Chinese made Westinghouse lamp that produced a deep red at startup, then eventually the startup color shifted to more of a magenta, purple

What BlueHalide said (arc tube not blackened yet and ALLOWING large UV to strike the phosphors) is correct. Also has to do with the chemical mix of some new lamps that initially has high invisible UV output. What is visible is the hyper excited DX coating.

But DOR132 come to Canada where it's -20°C nightly. Switch a CFL light on,.. it lights after a 30 second struggle.