By their very nature, data centers are heavily dependent on power being on 100% of the time and strong lighting available throughout, as often technicians are working on hard-to-see and hard-to-get-to places that require good visibility. And now that we have super sized data centers that house thousands or tens of thousands of computers, dependable power and good lighting are crucial. Most data centers are backed of by generators that are cycled on at least weekly to insure they are ready when needed. In fact most have two or more generators that back each other up.
It is forecast that data centers will use approximately 140 billion kWh in a single year, being charges back to customers at an estimated total of about $14 billion. Of course a relatively small amount of the total electric consumption within a data center is due to lighting, about 5%, but this still represents a substantial amount of money and efficiencies can both reduce costs and also help protect the environment due to decreased demand.
Another thing to consider is maintenance of light sources, particularly those with short life spans. This can also add up to substantial costs.
LED lighting for data centers last a lot longer and therefore reduce maintenance as well as electric costs, plus they put out a lot of light which is helpful for the reasons mentioned above. This type of lighting is safer and more friendly to other electrical components.
There is a lot of information available on this topic. One site that has a lot is the lighting center. You can find a lot of statistics and measurements here.
Another thing to consider in these days of pandemics and viruses are UVC lights in entryways to kill viruses and protect the staff from infection. Though these lights have been around for decades, this is really bleeding edge technology at this point due to the fact that they have not been used on people before. But there is a fortune to be made in lighting that can kill viruses while not harming humans so the research is going at a blistering pace.
One company at the forefront of this technology is a UV and UVC germicidal lighting company called, unimaginatively, GermicidalUV . You can read more about the technology on this site. They even have robots that can roam around the office or data center space when it is unoccupied emitting virus-killing light (which at this stage is not safe for humans) to kill and germs before it is occupied by the next shift. It is quite remarkable. There are a number of companies vying for this space, and their websites are fascinating to read.
There is a robot made at MIT and another made by a Swedish company that are both effective at killing the virus.