Try this: http://www.amazon.com/Triangle-Bulbs-White-Waterproof-Flexible/dp/B005EHHLD8/ref=pd_sim_e_1?ie=UTF8&refRID=1W4MC52W92ME8TZQAZ79

I don't think the lights are meant to be submerged.

If you plan on putting these lights outdoor, you should absolutely leverage your landscape lights if you have them. Its way easier and cheaper than to use the standard 120V transformer. Your landscape transformer outputs 12V AC. You need 12V DC for the LED. I recommend you get one of these to get the conversion done. It is a very small device so makes it easier to hide. 1/3 the cost of buying the transformers and a timer to control it (or worst, trying to find an outlet for the transformer). You can get it from Amazon. http://www.amazon.com/dp/B00SGMW4K8 A demo is here: https://www.youtube.com/watch?v=OJzarYlOnPc?