Best GU10 LED BULBS IN UK and MR16 LED BULBS IN UK

If you have read my other blogs about GU10 mains voltage halogen lighting, you will know that I have mostly replaced these bulbs with LED equivalents.  While the bulbs in my house are predominantly GU10 mains halogens, I do have a couple of MR16 bulbs.  Because of the lower voltages, the MR16 bulbs are the type used in my shower fittings.  Now I had tried LED MR16 equivalent bulbs in these fittings , but they either flashed briefly then went off or flashed repeatedly like a strobe light.  The reason these LED 3 watts replacements didn't work is due to the power supply.  When replacing with LED bulbs they found they had to keep at least one halogen in the circuit to keep the load high, or they would experience the strobing effect.

The output is polarised, so the transformer indicates positive (+ve) and negative (-ve) outputs, though neither of the bulbs had any polarity markings and both appeared to work connected either way. If you are replacing MR16 bulbs 9as opposed to GU10) you may well also need to replace the transformers, as the Halogen 12v supplies will have a minimum load bigger than the total wattage of 6 LED bulbs 9as per blog).

Can you give a more detailed subjective description of the relative light levels of the different MR16 bulbs you tried, compared to each other and to the original halogens, what was the rated wattage of the halogens, and so on. I need to buy 6 bulbs, and £10-£20 each I need to be sure I'm getting the right ones, and this kind of information seems to be a quite closely guarded secret! In general terms I have found the LED equivalents slightly dimmer that halogens and with a more yellow tint.  Whereas the LED specific transformers can only support LED bulbs due to the lower ratings.

I'm awaiting a 6watt GU10 bulb to try for a few applications in my kitchen which require a bright spot light beam. I have tried several of the sheerLED  MR16 lamps and found that the 4w version which seem to be the most common (have an aluminum spiral back heat fin) seem the best and produce about an equivalent of 35w halogen.  All they have done with these is add an extra LED (5 LED's instead of 4) but the little mini power supply inside is the same....they dont output as much light and buzz and whistle. I was replacing an existing 12v halogen transformer with a 12v LED transformer.

So far by replacing 20 of the 50W halogen lamps with the 4W LED versions (and disconnecting the transformers so that one single transformer runs 4-6 LED lamps depending on the room used - each transformer uses 10w in heat loss...)the quarterly power bill decreased by more than $50. For this reason you need to purchase specific LED type switch mode power supplied which do not have a high frequency output.  I've just bought some LED equivalents to try and reduce the electricity cost but can't get any of the LED's to work when i swap them out with the halogens.