meirs Apr 4, 2013:

just a note airport/airstrip runway lights are in series (and there is a constant current source that feeds them) - so that all of them get the same power and produce consistent light intensity dspite several kilometers of cabling

Tony M Apr 4, 2013:

Neither! We need more context here, as it is unclear and potentially ambiguous. We need to know a lot more about product X and its features here.

However, from the purely linguistic standpoint of the few words we have in front of us, I would say that neither of your suggestions is likely; it is hard to see why any feature of this 'product x' would enable long cable runs — and indeed, I'd be surprised if they were to use 'run' without 'cable' unless that was somehow made clear in the surrounding text.

Likewise, 'run' would not be a normal way to express lamp life etc. — 'long-running' might be used in this sort of context, but not 'run length'.

Always, however, with the important caveat that if this is in fact non-native EN, then of course anything is possible. As ever, only more context may possibly enable us to figure it out.