Have a link to some IP68 rated lights?Just thought you guys should know that the IP67 rated led's are only submersible up to a half hour. IP68 is continuously submerged. The first number, 6, is how dust-proof it is with 6 being the highest. The second number, 7 or 8, is how it reacts to liquids. 7 is one meter depth for 30 minutes and 8 (the highest) is over one meter depth and continuously submerged. So the people on Amazon that claim their IP67 led's are waterproof are only telling half the story.
So those of you using them in your sump be mindful and may want to put the reactor on a stand. I just looked up the IP ratings from an led manufacturer, not what the people on Amazon say.