hang on, from your last post, i take it that you are not an electrician, but a home owner, wanting to replace lights in your own home. if that is the case, you are doing a like for like replacement and, if you are competent to do the job yourself, then there is nothing to stop you. don't get me wrong. i would not advocate an untrained person to take on work requiring installing and testing by a qualified electrician, but from what you say, the job is no diferrent than replacing a defective pendant or socket outlet. if you feel you can do the job properly, do so.