From creators of the mod "CUBE" - the second slice of OTHER-LIFE universe.
Interesting... I'm afraid I've got no clue how to solve this! :p
Well we can't solve a code with only 3 possible letters out of 26. Still, I'm not sure if the real clue is the company's name on each light bulb, or the name of the flower inside.
Based on the amber glowing symbol of the Dharma logo, I would say you must solve the Aperture and/or Black Mesa first before you get an inkling of what the center one is.
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