re: Actually what they're detecting is a 'force'. .. so far, no light.
Fundamentaly and from what I understand is that energy, dark enigmatic energy ultimately comes from a light source. It's just that in this case all they have detected is a dark, maybe repulsive energy from which source they/we can't understand or detect yet.
Energy is dark, SDAI and it ultimately came from a light, energy rich source, aka, Mickey Mouse came from Walt Disney. :}