Good Evening, I have a box room in my house that has 4 LED downlights. When they're switched on there is a noticeable 0.5s delay, almost like a flicker, before they turn on. I've attached a rough diagram of the wiring. (Its a very simple set-up). They're brand new lights - so not older style or anything. Just wondering if that'd the norm ... but my kitchen LEDs don't do the same? The wires are very old - black and red 2 core and earth so could that impact it?