Rot Lop Fan is a Green Lantern whose species comes from an entirely lightless section of space. Green Lantern Katma Tui thought Rot Lop Fan was an ideal candidate for the Green Lantern Corps, and approached him to request he join the Green Lantern Corps. However, to an entirely sightless being, the terms “green” and “lantern” had no meaning.
Rot Lop Fan’s species had an advanced sense of hearing. Katma Tui reasoned that if she could not explain the concept of light, she would translate using sound. She introduced the Green Lantern Corps as the “F-Sharp Bell Corps”, and Rot Lop Fan’s outfit and power ring were modified accordingly to resemble a bell.
This is a reasonable accommodation, but since there apparently isn’t a sound-related term for other Lantern Corps, he is going to be very confused when his fellow “F-Sharp Bell Corps” members mention the Red, Blue, Orange, Black, and White Lantern Corps.
Below is a possible way Katma Tui could explain light to Rot Lop Fan. As the idea of visible light is entirely new to Rot Lop Fan, the explanation is kept simple. As I don’t know how technologically advanced Rot Lop Fan’s society is, scientific jargon is not included.
“In most known areas of space, life is supported by the energy created by hot spheres of gas in space. These are called “suns”. The suns are huge, heavy [dense] and full of flammable gases. Suns gain energy by mashing very tiny pieces of objects [atoms] together. When the two pieces are mashed together, they stick to each other and become one piece. In this process, energy is released. The energy can travel great distances, like a shout.
When it reaches a planet, it bounces off objects and changes properties. This is like making a sound in a cave: the sound bounces off the walls and the original sound changes. However, the energy from the sun isn’t amplified when it bounces off surfaces. Instead, some of the energy is absorbed by tiny structures in the object. It’s like how [fuzzy object from Rot Lop Fan’s planet] muffles sounds.
Other parts of the energy can still bounce off the object. Some peoples on other planets can detect the sun energy that bounces off objects. They call this energy ‘light’. The light is in a continuum, like the incremental changes between a soft sound and a loud sound. Each range of increments is called a ‘color’. Light in the weakest range is called ‘red’, while light in the strongest range is called ‘violet.’ Between those two is a range of ‘colors’, including the ‘color’ ‘green’. We made so many terms for these increments of sun energy because detecting light is an important sense to many peoples, and we can’t hear as well as your people can.
The creators of what you know as the F-Sharp Bell Corps gave enforcers of the law a tool that would be recognizable by the specific range of light increments that were absorbed. This specific range was called ‘green’. The tool had a round shape and fit around a finger; such objects are called ‘rings’. The tool also gave its user great power. Thus, the creators of the tool called it a ‘Green Power Ring.’
The wielders of a ‘Green Power Ring’ are named after an object called a ‘lantern’. ‘Lanterns’ were used by peoples whose primary sense relied on light to find their way in places without light. ‘Lanterns’ contained a very hot thing that is similar to a sun [a flame], and as such also produced light. As the wielders of a ‘Green Power Ring’ can make light using their ‘Green Power Ring’, they are called ‘Green Lanterns.’ “