maglite help

[Midnitemo]

I have a number of maglites and would like to upgrade them to LED mainly to make the batteries go further, on looking on the preppers saviour(ebay)there are all manner of upgrades available , what i'm after is the same or near light characteristics for less power usage , got a single aaa two double a's and a 3d cells model...i like maglites and want to carry on using them as they have served me well for many years...any one know what lumens they are as standard? and with LED's will the mini maglites still function in candle mode?