Philosophy shithead here!

A 15,000,000,000,000 bulb, of course!

But how could we know that that object illuminated by a 15,000,000,000,000 Lumen bulb is even real? For all you know, that massive object illuminated by a 15,000,000,000,000 Lumen bulb could be a fiction, a simple 15,000,000,000,000 Lumen shadow upon the wall!