I accidentally sent my Explorer on a quest when his happiness level was 10%.
Now even after 22 hours he is still at the same level.
My doubt is whether I have spoiled his otherwise successful quest.
Pls clarify! 
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Srikumar Krishna Iyer
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50 is the maximum level. Aside from that, I have no idea if happiness has any effect on success in exploration. – Unionhawk Jun 07 '16 at 17:49
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I have no reason to think that the happiness has any effect. I certainly haven't noticed any difference, but I haven't scienced it either. – DCShannon Jun 07 '16 at 21:17
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I actually did explore this recently, and short answer is no. Dweller happiness only affects your "Weekly reports". It has no effect on production, a dwellers SPECIAL, or wasteland expeditions. (This was part of my experiments to find what increases dweller happiness).
I tested this by choosing one of my most successful explorers, and placing him in a room full of corpses (his happiness plummeted from 100 to about 15 in a minute flat) then stuck him out in the wasteland. He was out there for his usual time (~1 day) and still came back with some good loot - it was actually the first time anyone returned with any Legendary items (got a Legendary recipe).
Needless to say I pampered that poor SOB as soon as he stepped inside the Vault.