Without knowing the ins and outs of the job it isn't possible to comment on wether or not that price is acceptable.a grand to replace two lights?
For example were they given all required access when they arrived or were they left twiddling their thumbs sat in the van for 3 hours?
It does sound quite steep yes, but at the end of the day the OP should have got a quote before contracting them to do the work so is the OPs fault.