The key word here is Active
Reflectors are passive, they reflect light
this solution emits light without any need of external light, so if you are approaching a junction, you will be visible much sooner.
Reflectors or reflective tape you will only be seen when lit by headlights
Regarding color, light-green'ish is a natural color of photoluminescent material used as a light source here
There is no law that permits use of green side lights as far as I know
What camera did you use to take the photo?
Headlights or as my photo shows, any other light incident from the same direction as that from which the driver is looking - street lights, shop lights or any other source of ambient light, from that direction.
I'm well aware of the difference between active and passive, and retroreflective means that light is reflected at 180 degrees to its incidence. To make the active option wothwhile it has to be more effective than the retroreflectives already available. Your picture suggests that your active solution has a very long way to go to catch up with 3M's efforts.
The camera was a Fuji A300, flash off, auto exposure as far as I remember..
I ride a good deal after dark, and my main area of concern isn't junctions. My front lighting makes me highly visible from well before and right up to any junction. My concern from the side is unlit roads, where I'm concerned with being seen at angles across the gaps around bends. The spoke and other reflectors I have fitted are targetted at that.
Bluntly, I have far less problems with being seen after dark than I do in daylight, and would be far more likely to spend money on a device for increasing daytime visibility than I would after dark, where I don't think I can usefully improve on what I have.
Ultimately the issue with visibility, day or night, has nothing to with the available technology or techniques and everything to do with drivers who don't pay attention to where they're going and don't look. What we need is some means of waking up the 1% of drivers who don't pay attention! No light, front, rear, side, up or down is of any value if the driver of the car coming the other way, behind you, at the junction, is looking at the screen on his iphone, looking at the passenger while chatting, is asleep, etc. or just doesn't notice the gorilla walking across the room.
An RPG plus launcher might be the answer.