These are bright and in the past I haven't had any problems getting bad nocks replaced. I've used them for years and love how bright they are. Lighted nocks are a wonderful aid to verify shot placement. I also very much prefer the shift nock over the older style. But! The last bunch I ordered I was less than impressed. It would appear that quality is starting to suffer. I think I bought 18 in my last order. Of those 1 didn't work at all, 1 was hit or miss and I had 2 break while leaving the string during the shot. The return/replacement process has also gotten harder. Likely due to people taking advantage. I still use them and still recommend them but I am disappointed in the quality decline over the last couple of years.