I think he meant that the T2 is a little brighter than the T1 (125 vs. 100 lumens). I agree that the T1 or T2 will be a great replacement for your X5. I have the T1 and have had a couple of X5s (both got stolen). The T1 is 100 lumens and the newest X5 (with Nichia CS l.e.d.s) is less than 30. Regulated runtime for the X5 is about 6 hours. Regulated runtime for the T1 is over 4 hours. Tint will be warmer for the T series lights than your blueish light X5.The T2,T3, T4, and T5 will give less runtime but more brightness. I think 100 lumens is enough. Any brighter and you can't use it for close range tasks (hotspot gets to be too bright). Make sure you get the 2008 version T series light. The 2007 T1 is rated for 85 lumens (mine seems a little brighter than the 2008 version) and only lasts 1.5 hours regulated. The 2007 version also uses a K2 l.e.d. so buy from a company verifying which model it is. If you go to a store, look at the runtime and brightness on the box and make sure they're not too low.