What led drop in for SureFire Z2?

Z

z_fedexbox

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What are the best options that i have? I'm not sure if i should go choose nailbender's, malkoff m60/m61 or xp-g, xp-e? What would be the brightest that the z2 could handle? What would be a good runtime/brightness? Also, can i use rechargeables with this light and if so what brand and where can i buy them? Also, there is white residue on the window, is this normal?
 
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