I use sonoff wireless network switches. To control my lights, fans, heater, dehumidifiers, ect. Ect. Ect. Wirelessly on my phone no matter where I'm at. I have controll of all my grow areas. They have both a green and blue led on them. Green is power on, the blue means connected to the network. They are on all the time. Pretty much. Inside my tent. I've nvr gotten a hermie from it. If it's one diode I doubt it has enough wattage/par/lumens to affect anything. I mean it's probably a 0.5 watt diode anyway. I wouldn't worry about. And btw I have 3 so sonoffs in a 2x4x5 tent.