I play magblade and get brought out of stealth by magelight. From my point of view, as a magblade, it is working.
Tip: I've heard that detect pots will stack with magelight.
But ...
People can make a small radius non-detect build. The build can reduce the range of magelight. Two sets that reduce the range of being detected are: (both are stam-based)
Night Mother's Embrace
Night Terror
add Khajiit and you'd have to be literally standing on top of the character.
Additionally, a nightblade build for speed can be out of any detect radius in a flash.
edit for clarity
Also just noticed this is in bug reports. It seems to be working against my magblades in cyrodiil. I don't know if there is an actual bug or not. This could be tested if you find a nightblade friend and activate duel.
I play magblade and get brought out of stealth by magelight. From my point of view, as a magblade, it is working.
Tip: I've heard that detect pots will stack with magelight.
But ...
People can make a small radius non-detect build. The build can reduce the range of magelight. Two sets that reduce the range of being detected are: (both are stam-based)
Night Mother's Embrace
Night Terror
add Khajiit and you'd have to be literally standing on top of the character.
Additionally, a nightblade build for speed can be out of any detect radius in a flash.
edit for clarity
Also just noticed this is in bug reports. It seems to be working against my magblades in cyrodiil. I don't know if there is an actual bug or not. This could be tested if you find a nightblade friend and activate duel.