I have the same NR Lumina 700 light and HAD a old Cateye Dual wireless computer on the same bike. Had he same interference issue on low and medium, and on flash it was inconsistent with occasional interference. I also had interference from other things on parts of my ride. On thing that seemed to cause interference was the newer electric street cars/trains in SF (whenever one was going by my computer would stop working).

I eventually got sick of it and got a newer ANT+ computer and sensor. No problems with that or with the BT sensors on my other bike. I think if you are going to go wireless its worth either doing BT or ANT+.