Sweet Seeds

So just leave everything as it is and keep the shed locked up yea?, Ill report back if i survived on Monday  thanks for your input.

It would be better than nothing until you find more efficient/powerful lights to replace them.   
When I thought about doing it initially, it was because I was thinking that outdoors, throughout the day the angle of the sun is changing so having some lights at a slight angle in each corner would help reach the spots that a static light from above wouldn't directly cover. 

The above really doesn't work in a big setup so Badbillybob's right about larger plants.   
Might have to revisit side lighting    
That actually occurred to me at one point too mate. But from experience - they aren't waterproof (even just high humidity) and they aren't very powerful. 

I would just say I've misplaced the keys and if they want to see inside tell them you will call them when you find them   And I wouldn't put your plants in your garage if it's attached to the house or on the property they will want to see in there 100%

Looks like bird shit   Its definetely not mildew though, I doubt its even fungal in nature. My first thought (other than bird shit) was it looks a bit like the chalky calcium residue left when hard water evaporates? Personally I wouldn't even be bothered about it, the rest of the plant looks fine.