What can one say about an LED replacement bulb? Its much brighter than the filament bulb it replaces. It is also much bluer in colour. I'm sure the 'burn time' from a set of batteries is greater than before, but that stands to reason since the current draw is lower. It IS a lot to pay for a bulb, but I'm the sort that likes intriguing (and well engineered) new devices, and the Maglite torch that I have is onesuch that 'needed' an update! WARNING! It really is very bright, so don't look into it when its on!! Brilliant! (pardon the pun)