175W Mercury Vapor coated lamp, mogul base, ED28 bulb by Howard Lighting H39KC-175/DX

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Bulb Cross Reference - for reference only, not a guarantee of compatibility.
EIKO P/N: H39KC-175/DX
GE (General Electric) P/N: HR175DX39
PHILIPS P/N: H39KC-175/DX
SLI P/N: H39KC-175/DX
Sylvania P/N: H39KC-175/DX