Yuiip 1.2W G4 LED Bulbs, Warm White 2700K, Non-Dimmable, 360° Beam Angle, No Flicker, 12V AC/DC, Halogen Replacement for 10-15W G4, Spot Bulb for Chandeliers & Lamps, Pack of 10

We bought a floor standing lamp some time ago. It had 5x 20 w halogen lamps and a transformer/ dimmer unit. The latter stopped working and I replaced it with just a 12v ac transformer with no dimmer. I had been looking for some time for G4 LED lamps to replace the halogens, but those I saw were always too big. These were just the right size and rated as AC/DC meaning could run off AC as well as DC supplies.They arrived very promptly and I replaced the halogens, but these new LEDs flickered. Were the lamps faulty or was it that the transformer could not handle the low power and current consumption? I replaced one lamp with a halogen and the flickering stopped, so I concluded it was the transformer.Ordered a new £5 12v DC LED driver transformer and problem solved. The lamps are not polarity dependent so it doesn't matter which way they are plugged in to the sockets. So far, so good. How long they will last is another matter, but that is always the problem with LED lights.So be aware that they might not be a direct replacement for a 12v Halogen. You may need to change the transformer too.

These bulbs are working well for me but I can see why some people give them bad reviews. I am running them on a variable voltage supply in order to dim them and this works well as I hardly ever want full power. What I did notice was that they went from very dim at about 8V to drawing their maximum rated power at just 10.1V. They are rated at 12 V and at that voltage would be seriously overloaded and would consequently burn out very quickly. I have therefore set an upper limit of 10V and expect them to last well. The original driver had a rated output of 12V but it was actually 16.5V when I measured it. Many drivers do produce more than 12V so that would make the problem even worse. No wonder many reviewers say they fail very quickly. A voltage limiting circuit is needed with this scenario.

I agree with other reviewers that these bulbs do fail - been using them for about a year as under-cupboard kitchen lights (on occasionally) and most have now failed - so I take issue with the 30,000 hours (3.4 years) life specification. However, that's a similar failure rate to the old halogen ones, so assuming that the energy specification is correct the reduction in energy usage pretty much balances the extra cost of the LEDs. Again as others have said, they do fit, and since it's real fiddly to fit them in my light sockets, I appreciate the convenience of being able to touch the glass when fitting. So despite the disappointing product life, I've ordered some more.No flickering at all in my installation, and a pleasant quality of light.

I wanted to replace the 7 G4 halogen bulbs I have in a display cabinet which I use as soft lighting in the evenings while watching TV. These bulbs are only 1.2 watts each compared to 10 watts with the halogen bulb, so I've gone from 70 watts down to 8.4 watts. Yes there is a saving there for my wallet as the cabinet is lite every night and for longer in the darker months so it all adds up to help do our bit to help the planet. Been using these bulbs for a week now so time will tell how long they last but the halogen also didn't last a great deal. These are slightly smaller than the halogen bulb so it fitted the tight space in the cabinet bulb holder. Some other brands are much larger so always check the bulb size but this brand you won't have a size issue.

I had a light fitting with 18 G4 bulbs of the less common 5w rating, which, despite the supposed 90w output, never gave the brightest light. Attractive and unusual it might have been, but if you wanted to read at night with elderly eyes it was a challenge. I first looked at changing to LED some years ago and the cost of 18 bulbs was prohibitive and a new driver was certainly going to be needed but prices have reduced dramatically.These bulbs are the same size as standard G4s, not particularly expensive at £1.50 each, and at 1.2 watt are twice as bright, yet run far cooler, than the bulbs they replace.The light is bright and neither too harshly white, nor tending towards yellow, giving a light close to daylight. I was concerned that I would need a new driver, and even ordered one ready to fit, but I inserted all the bulbs without any problem and, two weeks on, there has been no sign of a flicker so the existing driver has coped.From 90 watts I am now down to 21.6 watts with twice the light output and with bulbs that should last for many years.UPDATETwo bulbs have failed, (27-07-19) which is a 10 per cent fail rate in three months so current 5 star rating pending.

After several failed attempts including big name brands, these LED G4 replacements actually fit where the halogen G4 lamps were previously in our kitchen under-cupboard light fittings. Most others are way too big. I have also replaced two of the original “12V AC” power supplies (so called “transformers”) with a single 12V DC LED driver, but two of the new LED lamps are currently still running off an original halogen “transformer”. On the other hand one remaining fitting fed from another “transformer” does not work with the new lamps, so there is a bit of a lottery with existing halogen AC 12v nominal transformer/power supplies due to lack of voltage regulation with the reduced load. But at least the dimensions of these bulbs are close enough to the originals that they do fit properly in the lamps. Not as bright as a 20W halogen of course, they are only 10W equivalent, but colour temp is a good visual match for the halogens. Ideally I would say replace any existing “transformers” with a dedicated constant voltage power supply for best results.