I just got Bontrager ION 700 RT light (Flare RT is on the way). These are ANT+ lights.
Regarding Edge 25's support of ANT+ light in 3.30 firmware: there's more less none. And very poorly implemented. Once you power on the Edge, it will automatically power on the light on high beam. It's not possible to change this behavior. And the only thing how you can actually control the light via Edge is to power it off and on again. When you hold the Edge power button (top left button), you get small context menu where you can choose whether you want to power off the light or the Edge. That's it.
Now, this was not the bad news, this was good news. Now the bad news:
You actually cannot use the Bontrager ION 700 RT light as stand alone light, not controlled by the Edge via this stupid simple mechanism described above. Because whenever the Edge detects the light around, it FORCES you to pair the light. How? Whenever the light gets close to Edge (within 10 meters), Edge shows pop-up message "Light detected, do you want to connect to it? Yes/No". And when you choose "No", you immediately get the same pop-up message again. Indefinitely. There's some deadlock in the Edge that when it detects light, you simply cannot refuse the pairing. You have to agree with pairing to break the vicious cycle of the pop-up message asking to pair it.
And the worse: suppose you're charging your Edge via external USB charger. You have the light paired, because you cannot have it not paired (see previous paragraph). You have the light powered off via the Edge command to power it off. Btw you cannot power it off via the button on the light, because if you do that, the Edge will immediately power it on again. So you power it off via Edge command. You leave the room with charging Edge to do something else. You return to the room 1 hour later only to find the light powered on, on high beam, slowly cooking itself.
To make myself clear, the light works perfectly fine alone, it does not power on by itself. It's only when it gets to range of Edge 25 and Edge starts meddling with it, forcing it's only light mode upon it and randomly powering it on. And you can't avoid that, because you have to pair the Edge 25 to be able to use it because of the vicious cycle of "light detected" infinite pop-up message.