On two occasions I have bought tickets at a well known online ticketing firm for concerts/shows. One being the Queen musical "We Will Rock You" in London, the other being Keane's concert at the Point a few weeks ago. At no mention during the purchasing process (ie time of gig, wheelchair access, etc) was strobe lighting mentioned.
When I arrived at both venues there were signs up saying "Strobe Lighting is In Effect during this show". My health is not the best and strobe lighting is a big no-no for me, so I had to leave both events (as did my wife). Both wasted, costly journeys.
If anyone suffers from my condition (tumour/epilepsy) ensure you check in advance whether strobe lighting will be used in the performance.
Also FYI I received refunds for my tickets along with my airfare to London and my taxi for The Point.