I just recently installed my Mars Hydro TSL2000 grow light and there's a weird electrical wisp/crackle sound from BOTH drivers when the device is off, but only after I've had it turned on. I can disconnect the power supply, reconnect it. No sound. I'll turn it on, no sound. But then when I turn it off, the sound is there, and does NOT make me feel very comfortable having it plugged in, let alone turned on for an hour or longer. Has anyone else had this issue? Or is this even an issue?