I know -- it's very tempting. Go on discount furniture sites such as Wayfair or Rakuten or even Target and you may see stuff you like. Well designed, cute lighting that might look good in your space. And the price will be a fraction of the cost that it would cost you if you sought out the original designer of that light. Even people of considerable means will think twice about paying for a designer-made fixture when a similar looking one is available at a much lower cost. And certainly there is not much difference between original and knock-off in terms of the function of the object: Both of them will light your space just fine.
But before hitting the buy now button for the cheaper option, I'd like persuade you that buying the more expensive chandelier, pendant, sconce, or lamp is absolutely worth the cost. Here's why: