The iPhone 5 might not have a dedicated notification light, but you can set the LED flash on its back to act like one. You enable this by going to the Accessibility features in the device's settings menu. That's the feature the team behind Sparx takes advantage of and makes it a lot more practical for every-day use.
Sparx is an iPhone 5 case, the top side of which is made out of transparent plastic. When the LED is blinking, the light is diffused throughout the plastic, allowing the whole transparent section to glow. As a result, you can see the notifications even when the smartphone is lying on the table with its screen up.
However, before anyone can buy the Sparx case for the iPhone 5, enough funding needs to be raised before its production can begin. Anyone who wants one of these can pledge $35 or more to the project on Kickstarter.