In my experience, good lighting is pretty much the only thing you're guaranteed at various warehouses. Heating huge spaces effectively is basically impossible, rugs and other "soft" surfaces are out since they just wear down too quickly, equipment will be used continuously until it's simply unsafe... but you need good lighting to know what you're doing and keep yourself out of harm's way. As noted, even the parking lots and immediate exteriors will be very well lit as a physical security measure.
Bad lighting is the exact kind of thing people complain about when maligning "hot shots who think they know everything" and all those etceteras. It ends up being penny wise and dollar stupid when you factor in both logistical mistakes and pay outs to worker's comp when people injure themselves on the job. The equivalent in programming would be making all your developers use laptops from 12 years ago running Windows XP because you know someone who got you a really good deal.
Even the damn lorry bays and car parks outside such things are usually spitting out far too much light.
The one thing I'd absolutely not imagine or expect would be "gloomy". That I would imagine for a mushroom farm and precious little else. How the hell would they pick the correct product in what sounds like gloomy yellow sodium lighting from years ago?