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Does an LED Bulb need to be "Pool Certified" or will the equivalent LED bulb with the proper specifications as to dimension and input voltage work as well? In other words, is there any difference between an pool/spa bulb and a standard bulb? Somehow I think the only real difference is between...

Have black/dark grey splotches over most of the bottom of the pool which first appeared about 2 -3 months ago. Can't really say that a chlorine puck test makes a lot of difference when putting one on top of it for a while. Just got my TF100 kit and have run the numbers. As it has rained a lot...