Each server is outfitted with a very bright, very environmentally friendly LED light that will last much longer than a CFL bulb. The shifting color spectrums are a signal to anyone walking between them about what each server's status is. It's reminiscent of a system you might see in NORAD. Photo 7 of 15 in A Rare Glimpse of Google's Data Centers by Skylar Bergl

A Rare Glimpse of Google's Data Centers

7 of 15

Each server is outfitted with a very bright, very environmentally friendly LED light that will last much longer than a CFL bulb. The shifting color spectrums are a signal to anyone walking between them about what each server's status is. It's reminiscent of a system you might see in NORAD.