For a quick verdict I connected my TillyTec HID 35 via umbilical cable to my Green Force Flexi II, turned it on, dumped it into a bucket of water and got 70' of bright white light out of it.
Considering the battery had been lying around for some time since I last recharged it, I guess that's not too bad. To be sure, I'll do another test later on, to check whether when freshly loaded it can still deliver its specified burntime of about 90'.
UPDATE: My HID 35 burned exactly 90' on a fully charged Flexi II.
