High Bay 22" Acrylic OPEN, 400W PS M155/O (Lamp included), 120/208/240/277V 60Hz, by Howard Lighting HAC22O-400-PS-4T

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Fixture Cross Reference - for reference only, not a guarantee of compatibility.
RUUD Lighting P/N: AR1640-M
Crescent/Stonco P/N: MBG22PMAOR-8
Simkar/CEW P/N: JLM0940-M
Atlas P/N: SU2240PQ-P
DuraGuard P/N: D-400-PSMH-ACHB22-MT-MP