I'd advise trying one first before launching out and buying many. They are not cheap, and in my experience thus far Rob, those which just fit into the std bayonet fitting are a bit disappointing in their brightness. However for internal reading lights, I have found the strip versions with 20-30 LEDs in each and which rotate thru an arc to aim them are great, and certainly do save battery drain. I have also found a round type for ceiling mount with a low and high switch, which has about 30 LEDs, dropping to ~10 in the low position - great over the galley, but again, needs to be mounted as a unit. They may have better brighter bayonet fit types now, but just be careful. The ones I got were supposed to be equal to the 5w they replaced but are so dim as to be useful as courtesy lights only.