I have the marina brand blue lunar leds in my tank. It's only 3 LEDs but it illuminates the whole tank my question is will this hurt my plants? Because they never get there perfect dark to end their photoperiod? So I'm hoping its not a problem and I'm over thinking this.
I think you've answered the question.
Next time during the waxing lunar cycle peaking with the full moon, go outside and observe the level of illumination of the landscape. Waxing lunar light even at full moon isn't bright enough to cause photosynthesis. Lunar light isn't blue [that's just marketing ] by the way, it's white. Fauna need a period of darkness too, just like all diurnal life forms do.