I agree. They seem to tick all the boxes - very low current draw and excellent bright light output plus great reliability.LED bulbs are the future of headlights.
You can't legally retro fit LED bulbs (or HID for that matter) into a headlamp unit designed for halogen bulbs.
Yes there are plenty of vendors on t'interweb that will sell you retro fit bulbs/kits to do precisely this, however that does not make them legal.
You will likely find they will also pass MOT & not get you stopped by the police - but that also doesn't make them legal.
Have an accident and have the other driver claim they were dazzled by your headlamps and attention will be drawn to them. At which point MOT passes are irrelevant - the only thing that matters in that moment is the Law - and the Law says they're not permitted. Which then means your insurers will very likely exercise the clause that exists in the T&Cs of every insurance policy - which states that it's your responsibility to ensure anything fitted to your car is legal and complies with regulations. The fact that your retro fitted LED or HID bulbs clearly are non-compliant and the other driver is claiming to have been dazzled is enough for them to void your claim & void your policy - leaving you to pick up the bill personally.
Sadly I know of an individual this happened to - in an S-max with retrofitted HIDs in projector headlamp units. They had passed MOTs & he'd never been pulled by police. He even advised his insurers of the modification so you'd think he'd be covered - but the insurers were happy with the modification but only if it was done legally (and retrofitting HID or LED in projectors e-marked for halogen use is not legal).
Other guy claimed he was dazzled & suffered injuries in the accident.
Other guy was awared £330,000 by the court. The S-max onwer's insurance bailed on him and left him to pay himself - resulting in having to sell his house and pay off the remaining debt over 7 years.
The only legal way to upgrade from halogen to LED or HID is to retro-fit the entire system that Kia would have fitted in the factory. Any less and you're leaving yourself open to liability...