Rule of thumb is darkness is key.... However in saying that the plants can still grow/flower under moonlight in nature so providing the light in your grow enviroment is way less than Moon light and is not of 6500k or 2700k light spectrum your plants will come to no harm, also if you are worried about this either cover the red light with black electrical tape or change the little red light for a little 'GREEN' light and this would not interfear with your grow what so ever because plants cant see green

- STELTHY