Thorn 250w Kolorarc MBIF/BU. First power up in 37 years.

Nice NOS early 250w Thorn fluorescent coated metal halide lamp for base-up operation.
At full power for the first time since it was manufactured back in 1979 and I unsealed it from it's box 37 years later.
Like the other 400w lamp, it ran up with a large yellow light but after several minutes the colour temperature increased to a lovely crisp cool white with very good CRI indeed.

Just imagine a factory or warehouse lit with these in Thorn HiPak fittings.. :)