High Bay 22" Acrylic w/ Conical Lens, 400W PS M155/E (Lamp included), 120/208/240/277V 60Hz, by Howard Lighting HAC22C-400-PS-4T

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Fixture Cross Reference - for reference only, not a guarantee of compatibility.
RUUD Lighting P/N: AR1640-M-Y
Crescent/Stonco P/N: MBC22400PMA-8
Simkar/CEW P/N: JLM0840-M-822CLA-HR
Atlas P/N: SU22C40PQ-P