LED's are a real pain, with 12 volt you have AC, and DC versions, it is likely those marked 50 Hz will still work with DC, but may not, and DC versions often with a 10 - 30 volt range will not work with AC. There are transformers, electronic transformers and drivers, the latter is divided into true drivers with current regulations and really 12 volt power supplies where voltage is regulated. The transformer is 50 Hz output and does not have a lower limit, an electronic transformer output is in kHz range and often has a lower limit often 20 - 50 VA so a LED under 20 watt will not work.
Less of a problem as you move from extra low voltage to low voltage, but even then some need load capacitors to stop it flashing when switched off
and some have it built into the bulb package this pair
are both G9 but the smaller one needs the load capacitor and tends to flicker but the standard covers will still fit, the other has the leakage resistor built in, and also a smoothing capacitor built in, but is that much larger the covers will not fit, but no flashing or flicker.
The big problem is there is nothing in the adverts or on the packaging to tell you which is which, so I have a draw full of good bulbs which for one reason or another were not suitable and so not used, and the LED lasts so long, not sure what I am going to do with them all, in some cases simply swapped from standard to smart bulbs so nothing really wrong with old bulb.
Four bulbs in my bedroom, one standard, and three smart, the latter came with the lamp fitting used in my wife's craft room, that also had a remote control which is used in her bedroom, all Lidi specials.
It is OK doing it for yourself, but doing it for others what do you do with the bulbs if it does not work? Last house fitted new chandelier in living room, originally two 100 watt tungsten bulbs, so fitted 10 compact fluorescent at 8 watt each, Philips, did not even last 18 months, so swapped for 10 x 3 watt LED too dim to read with, so fitted them into mother house with smaller living room, and went for 5 watt LED, so much for LED saving as went from 200 watt to 50 watt, that's not what the charts say the equivalent is.
This house one 100 watt tungsten to 8 x 6 watt LED, so 48 watt, again not with the charts show.
The main problem is the tungsten shone in all directions, but the LED is far more directional, so pointing down floor will absorb the light, and up the ceiling will (if white) reflect the light, so bulb point up and down makes a huge difference. I like LED for low maintenance but for selection they are a pain, found my daughter has head ache with main living room lights, with have to use just the decoration lights when she visits, likely they flash at 100 Hz no smoothing capacitor.
