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What exactly are you looking for? Photon star are putting ARM processors in some of their lights. Are you looking for fancy tech or just light?

There are several threads on GU10 and MR16 LED bulbs. Bulbs with this specification (eg > 400 Lumens) are working well for me..

http://www.ebay.co.uk/itm/GU10-27x5050-SMD-LED-DIMMABLE-5-5w-460-LUMENS-BULB-REPLACES-50-60w-HALOGEN-/310397791463?pt=UK_Light_Bulbs&var=&hash=item4845266ce7

I can't vouch for that particular supplier but thats the general type/spec. Ideally if this was for a new build you would find fittings specifically designed for LEDs but they tend to be quite expensive.

MR16 would be better than GU10 because GU10 have a transformer in the bulb which may well fail before the LEDs themselves.

Best put them in this type of fitting rather than a recessed downlight...

https://www.energybulbs.co.uk/custom/upload/images/products/2/600x600/A2_BLM5733.jpg

Mine are in a mixture of fittings but the life expectance in a recessed downlight is unknown. There is concern they may run too hot. Mine were purchased in late 2011. Not had any fails so far.

Posted By: CWattersMR16 would be better than GU10 because GU10 have a transformer in the bulb which may well fail before the LEDs themselves.

Is that just a theoretical possibility or have you seen it happen? I am not sure it's much better if you fit 12V LED bulbs and then use 240/12V transformers designed for halogen lighting. The trannies are notoriously prone to failure, and as expensive to replace as some of the cheaper LED bulbs now on the market (not that I'd recommend buying the cheapest LEDs).

I went for LED units. It did cost a great deal of cash but it is a long term investment. I purchased some GU10 directly from China but they are the supplier of a well known company mentioned on here but the units are much cheaper if you buy direct. I also fitted JCC 7 watt units with a 10 year guarantee. The output is not fantastis but I wanted the 10 year safety net. The output is average I would say when you look at it. Obviously it depends on the colour. If you need details then I can whisper.

Some LEDs are so expensive you could replace cheap MR16/GU10 several times over for the same money. It's a tricky decision.

Yes I agree with CWatters but the energy saving tends to go out of the window as you make all of the cheap LED's to replace the cheap LED's.

I have to say I don't see much problem with what is already available. For new down lighters the Halers Evo leds are very good and for replacement GU10s cheap SMD type off ebay are working fine for me. We also have some under cupboard leds again no problems to date. I have probably now jinksed all my lights to fail but I really think there are quite a few good off the shelf options available. The only thing I have yet to find is a good MR16 replacement.

Posted By: CWatterscheap MR16/GU10

pack of 2 50W GU10s for £1 in local pound shop!

I bought some from Amazon recently: http://www.amazon.co.uk/gp/product/B008VSHMQI/ref=oh_details_o02_s00_i00 - they're actually very impressive - easily bright enough to replace the halogens!

Unfortunately I had to send them back as the missus was a big "NO" (far too fussy)! The issue with LED replacements is that even the warm white is too cold for my other half.

I found this book a useful reference point: http://www.amazon.co.uk/gp/product/1845433572/

Haitz's Law as described there is about the cost and packaging, not the efficiency.

Dunno, but I suspect the price of PV is, at the moment, driven by overproduction for the size of the reduced market resulting from reductions in European FITs rather than by technological development. In fact, I'd be surprised if there's much development at all going on just now in actual production capacity (as opposed to long-term thin film research, etc).

Hello
As part of a long-planned renovation, we're putting in new lighting throughout downstairs and I'm keen to go LED but nervous about it: is it the wrong decision given a) current service (brightness, hue, longevity, efficiency) per £ and/or b) trajectory of improvement (problem being we need some light while we wait for 'the next generation').
The renovation includes installing ceilings where previously only rafters. With fairly low head room (c210cm) keen to go mostly for flush fitted down lighters in the ceiling for principal lighting, maybe complemented with spots, lamps and uplighters.
I'd be really grateful for advice:
a) on whether going LED is sensible now (given that not everyone is the house is willing to suffer reduced service levels (brightness, hue) for the planet)
b) if not, what should it be? is it possible to put in a system now that will be easy to retrofit once LEDs have reached whatever plateau of development is awaited?
c) if so, what systems should I be looking at, either in terms of principles (like, just get GU10s and fit LEDs or dedicated fitting/light? shared driver? if wanting variation should it be through dimmable lights or through separate circuits?;) or (ideally) specific recommendations.
Thanks
Matt

Just one thing to consider with LED lighting for living spaces (and CFLs to an extent) - they produce a large amount of energy in the blue part of the spectrum (even warm white LEDs do this). This blue component interferes with serotonin production and therefore disturbs sleep patterns. There's some good evidence out there that blue light should be avoided for at least an hour before attempting to go to sleep (this includes computer screens and TVs for that matter). Over here, we're involved with getting street lighting switched over to LEDs, but are pushing hard for amber, rather than white for two reasons. One being the health effects and the other is that blue light is scattered more than red so affects dark skies (for astronomy) more greatly the light which doesn't include blue.

I can dig out some papers for anyone interested.

Paul in Montreal.

I doubt that the problem is due to UV. LEDs produce much less UV light than halogen bulbs or some CFL.

http://store.letsled.com/Articles.asp?ID=247