G2/3 NVG's can see 850 and 940. 940 is about 40% dimmer than 850 when viewed by NVG's. The output power is the same but just looks dimmer. Only advantage of 940 is if you are trying to be sneaky over large areas as someone spotting will have more difficultly seeing 940 after 300 meters. For airsoft a 850 is cheaper and probably the best option.