splotchy brown spots on droopy leaves (12 day old sprouts) pics incl.

Hello I'm wondering if anyone can identify this problem, day 12 still using spring(distilled) water in soiless mix heat ranges from 70-80 F watering when top layer of soil is dry and pot feels lighter ~2days. 2600 lumen CFL about 3 inches away from plant.
Thanks!

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How small is your pot if you're watering every 2 days? I was able to go over 5 days without watering coco in 4" square pots at that stage.

At this point you can start adding a very weak nute mix, a little stronger mix if the cotyldons have begun losing their color.
 
Its burnt. Do you know your ph? Does the soil have nutes already in it? What is the soil/mix?

A clear party cup (hum dome) on top lil plants works wonders especially when they are sick they get pure water through the leaves.
 
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