Green Building Forum - LED MR16 Mon, 25 May 2026 08:49:14 +0100 https://www.greenbuildingforum.co.uk/newforum/ Lussumo Vanilla 1.0.3 LED MR16 https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=18045&Focus=304541#Comment_304541 https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=18045&Focus=304541#Comment_304541 Fri, 08 Dec 2023 15:56:08 +0000 Rex
Have a 12v 5W halogen in the garage door opening motor that has given up the ghost. Would like to replace with a wider beam angle bulb and LED seems to be the way to go.

But seems that it is not so easy to just plug one in (balanced transformer / flickering) or am I missing something?

Will any of China's finest 12V 5W LED bulbs be plug and go or do I need to fiddle with things?

Thanks]]> LED MR16 https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=18045&Focus=304542#Comment_304542 https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=18045&Focus=304542#Comment_304542 Fri, 08 Dec 2023 17:32:42 +0000 owlman You may find a wider choice of beam widths and outputs etc in LED GU10.]]> LED MR16 https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=18045&Focus=304546#Comment_304546 https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=18045&Focus=304546#Comment_304546 Fri, 08 Dec 2023 21:56:52 +0000 djh LED MR16 https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=18045&Focus=304548#Comment_304548 https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=18045&Focus=304548#Comment_304548 Sat, 09 Dec 2023 07:42:55 +0000 Rex
As for the bulb holder itself, there is only the ceramic base with the two wires, not actually fixed to anything, just floating. The bulb is kept in place by a C shaped spring around the edge circumference.

A for the number on the bulb, only listing what is printed. The brightness is not so important as the light only runs for three mins as a default when the door is opened or closed. It is not a garage illuminating light.]]> LED MR16 https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=18045&Focus=304552#Comment_304552 https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=18045&Focus=304552#Comment_304552 Sat, 09 Dec 2023 13:08:30 +0000 owlman
https://www.toolstation.com/spare-lampholder/p93364]]> LED MR16 https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=18045&Focus=304618#Comment_304618 https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=18045&Focus=304618#Comment_304618 Sat, 16 Dec 2023 07:32:35 +0000 Rex
I have inadvertently ordered and had delivered a 240v LED MR16 rather than what I though I was ordering, a 12v.

Given Owlman's suggestion above, is there any reason that I should not by-pass the transformer and just attach the 240v wires directly to the existing MR16 bulb holder? Would both wires and holder be designed to handle 240v?]]> LED MR16 https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=18045&Focus=304619#Comment_304619 https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=18045&Focus=304619#Comment_304619 Sat, 16 Dec 2023 10:59:19 +0000 owlman LED MR16 https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=18045&Focus=304620#Comment_304620 https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=18045&Focus=304620#Comment_304620 Sat, 16 Dec 2023 11:52:56 +0000 djh LED MR16 https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=18045&Focus=304643#Comment_304643 https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=18045&Focus=304643#Comment_304643 Sun, 17 Dec 2023 12:22:38 +0000 Rex
Would be happy with a 12v LED MR16 but seems that a single bulb will not run from the existing transformer. Is that right? I just want to plug in a replacement LED wider beam bulb but everything I am reading mentions the need for an LED transformer or a number of LED bulbs to equate to the wattage output of the existing transformer.]]> LED MR16 https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=18045&Focus=304645#Comment_304645 https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=18045&Focus=304645#Comment_304645 Sun, 17 Dec 2023 14:42:00 +0000 owlman If you want to ditch 12V in favour of mains then best to go GU10.
I can't remember where I once read about mains MR16 not being compliant. It may well be OK; I'm guessing here but it may also be something to do with the flimsy pin connectors, the twist and lock GU10 being more secure for mains usage .]]> LED MR16 https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=18045&Focus=304649#Comment_304649 https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=18045&Focus=304649#Comment_304649 Sun, 17 Dec 2023 17:46:41 +0000 Peter_in_Hungary e.g.

https://jet.hu/zar0307-led-izzo-20-smd-2835-4w-mr16-230v-17676

Whilst these are over here they must be EU compliant so should be OK for UK despite Brexit.]]> LED MR16 https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=18045&Focus=304651#Comment_304651 https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=18045&Focus=304651#Comment_304651 Sun, 17 Dec 2023 18:33:24 +0000 owlman OK, compliant was maybe the wrong word. Rex inadvertently bought an MR16 reflector with a GU5.3 base instead of a GU10 base.
I was attempting to answer whether a GU5.3 base is permissible for mains voltage in general household use, as opposed to factory fitted specific equipment, which can be the case.
Possibly this may lead to confusion and people replacing 12V GU5.3s reflectors with mains voltage ones and vice versa. Hence the GU10 base being the more usual mains voltage option.
I don't know if this is the case just surmising.]]> LED MR16 https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=18045&Focus=304652#Comment_304652 https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=18045&Focus=304652#Comment_304652 Sun, 17 Dec 2023 19:37:18 +0000 Rex
Thanks for the thoughts. I did not actually buy a MR16 reflector with a GU5.3 base, the garage door operator came with it fitted.

Seems the best option is to buy a GU10 base and wire it directly to the incoming mains. My guess is that the motor itself operates from a transformer.

Will give some thought to opening the unit and have a browse.]]> LED MR16 https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=18045&Focus=304654#Comment_304654 https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=18045&Focus=304654#Comment_304654 Sun, 17 Dec 2023 21:02:14 +0000 djh Posted By: RexSeems the best option is to buy a GU10 base and wire it directly to the incoming mains. My guess is that the motor itself operates from a transformer.Depends whether mains is fed to the unit and the voltage reduced by a transformer inside it, or whether the voltage is reduced by a wall wart and only 12 V is supplied to the opener.]]> LED MR16 https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=18045&Focus=304665#Comment_304665 https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=18045&Focus=304665#Comment_304665 Mon, 18 Dec 2023 13:18:50 +0000 Rex LED MR16 https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=18045&Focus=304672#Comment_304672 https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=18045&Focus=304672#Comment_304672 Mon, 18 Dec 2023 19:03:55 +0000 Rex
But I have found this which does tick one box, that of a wider beam angle.

https://www.amazon.co.uk/Spotlight-Generation-Equivalent-Halogen-Dimmable/dp/B07J5TJ1S2/ref=sr_1_42?keywords=MR16%2BBulb&qid=1702923211&sr=8-42&th=1

Given what I have read that I need an LED that says 'the equivalent of' and this exceed the halogen of 35W, is this likely to work flicker free? Although it does say it needs a LED transformer and I don't imagine it is possible to wire one into the motor housing so that it does give the 3 minutes.]]> LED MR16 https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=18045&Focus=304673#Comment_304673 https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=18045&Focus=304673#Comment_304673 Mon, 18 Dec 2023 19:44:52 +0000 Peter_in_Hungary You can get adjustible timers for bathroom fans that come on with the bathroom light - in your case the start of the door motor - and will stay on until the light (door motor) stops and then over runs by the set time then turns off.
The wiring is permanent neutral, permanent live and a live feed from the switched power to the motor.]]> LED MR16 https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=18045&Focus=304677#Comment_304677 https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=18045&Focus=304677#Comment_304677 Tue, 19 Dec 2023 12:55:19 +0000 Rex
Plugged it in and it works, so will stay with that.

As an aside, the box energy graph says it has an energy rating of G. As a low wattage LED, how is that possible? Though all LED lights got up near the A or B mark.

The box also says, 360 Useful Lumens and 500 Total Lumens. What does this mean?

Thanks for all the advice; have a Cool Yule!]]> LED MR16 https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=18045&Focus=304682#Comment_304682 https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=18045&Focus=304682#Comment_304682 Wed, 20 Dec 2023 00:31:36 +0000 Mike1 Posted By: Rexthe box energy graph says it has an energy rating of G. As a low wattage LED, how is that possible?New ratings came in a couple of years ago, with new assessment methods and a major downgrade to avoid nearly all LED bulbs being rated A / A+ / A++ / A+++.

Posted By: RexThe box also says, 360 Useful Lumens and 500 Total Lumens. What does this mean?
For a directional lamp (yours is supposedly 60°) rather than a non-directional one (intended to light a room in all directions), the 'useful lumens' is the amount of light that falls roughly in the direction that it is supposed to. In your case 140 lumens falls well outside this direction and therefore doesn't get taken into account in the efficiency calculation, Which will be a significant reason behind the G rating.]]> LED MR16 https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=18045&Focus=304685#Comment_304685 https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=18045&Focus=304685#Comment_304685 Wed, 20 Dec 2023 07:39:54 +0000 Rex
Regulations changing. What a racket! Does that mean the only way to get a bulb with an A or B rating is to use no electricity whatsoever?

Recently had an EPC check done on a 1960's maisonette that I rent out. Ten years ago, it got a D rating; this time, it got a D again but the score was much closer to C. However, I was told that next year, the rating parameters change and it would be rated at least E, if not lower.]]> LED MR16 https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=18045&Focus=304702#Comment_304702 https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=18045&Focus=304702#Comment_304702 Thu, 21 Dec 2023 01:41:14 +0000 wookey Posted By: Rex
The box also says, 360 Useful Lumens and 500 Total Lumens. What does this mean?

360 is the amount of light that falls in the 'useful' area (however that is defined). The other 140 goes elsewhere.

The original design of the MR16 was for halogen bulbs, and it is normally a dichroic lamp - i.e. the visible and UV/IR light are separated with the visible light going forward and the UV/IR light back ( so as not to damage/overheat whatever was being illuminated). That splitting may account for 1/3rd of the output going elsewhere, or it may simply be to do with how much is actually collimated by the lamp body. I'm not sure if LED versions of these lamps still have the dichroic coating or not. (in an LED about 50% of the energy ends up as heat - in the Halogen version 90% was heat, 10% light so it's less necessary, but still useful).]]>