Good question! Well, remember that things glow when they get hot, and the hotter they are, the brighter they glow. So for example, a red-hot piece of metal is not as hot as a white-hot piece of metal.

But there's a limit to hot how something can get before it melts, and that puts a limit on how brightly it can glow without melting. Tungsten is used in light bulbs because it has a very high melting point: it melts at 3,422 degrees Celsius! Nichrome, on the other hand, melts at 1,400 degrees Celsius. So it's not that tungsten glows brighter than nichrome; it's that you can heat up tungsten to a much higher temperature than nichrome without it melting, so it can glow brighter without melting.