I had some of the Lidl lights last year - they were part of a mixed set - got about 20 packets! They all worked fine - the different colours provided different light intensity with the Blue being pretty rubbish (OK on a very dark night with no light pollution - so hopeless on the Solent!). On average the last about 3-4 hours less if very cold. They were OK for the £. I'll be looking to get some more today!
i bought a box yesterday afternoon and tried one of the red ones when i got home, it was still quite bright this morning when i got up for work this morning and it`s still giving off a bit of light now.