Usually "that much ripple" is caused by a failed rectifier or transistor and a failed rectifier or transistor will reduce converter output potential to the point of flickering LED's would be perhaps No 16 in a long list of complaints about power problems.
I've got smd panels that the WFCO loves to hassle. But only when the battery is fully charged. Trashy product forced me to consider the 10 watt chips. The quality of the light rendered is a world apart, but then the ugly proposition of heat sinking jumps up. Light emitting diodes need to improve their efficiency to 30-40% before I will be impressed by the concept. I am using conventional "heaters" because of instant-on and daylight rendition which CFL cannot match. Also Mexican power loves to play whips and chains with CFL lamps.
I don't think there's enough room in the fixture "base assembly" to hide a 47uf 25 volt cap. So that's why I recommended a KONI grade shock absorber right at the converter. Cheap, fast, effective fix. If the converter is bad, somehow, the cap will give it a shot of morphine and it may last awhile longer. But usually a bad converter really messes with TV and radio - just think of all that lovely antenna structure in walls and ceiling.