The light bulb is not a human creation. The truth is that 90% of human technology has been the direct result of the order involvement. There is no reason for the order to take credit for something that has not been done by them. The light bulb was given to humans to get them out of the dark ages and to help them find their way into a better lifestyle. This allowed for a few human inventions to be created, but for the most part, the inventiveness of the human mind has been far from convincing so far.
The order has been thinking about how much longer they will be helping humans in their evolution. There are hopes that the humans will soon begin to catch up as they should. Otherwise they might face extermination once the order stops protecting them from their many enemies.