• Welcome to the new forum. We're now hosted on ElectriciansForums.net rather than ElectriciansForums.co.uk - Chat about the forum upgrade by CLICKING HERE

Welcome to our Electrical Forum - We started out providing electrical advice just for the UK - But now we have specific advice for the USA too! - Register for free and share American Electrical Advice.

Discuss Do MR16 Led bulbs require a LED driver or a transformer? in the Electrical Forum area at ElectriciansForums.net

captaincaveman

Regular EF Member
Hi guys,

Quick question regarding 5x MR16 (Gu5.3) Led bulbs in downlighters. The customer used to use halogen but has moved over to LED. They had stopped working due to a faulty 12v transformer
I've just replaced the transformer with a constant voltage driver (1-25w) but with any more than 3 bulbs inserted then they all seem to flash. Due to time I left it working with 3 and was due to return to sort it but she says her son has replaced the driver with a 12v transformer and they are all working fine!

MR16s don't have built in drivers do they?

Cheers in advance
 
Professional Grade LED Lighting Strips

Murdoch

Electrician's Arms
MR16 LED's require an appropriate transformer.

Not all existing transformers "like" LED's
 

SparkyAndGeorge

Electrician's Arms
Why dont you replace the lamp holders with GU10's and get some GU10 LED's. You can then disconnect the driver/tranny giving one less thing to go wrong.
 

stoneworld

EF Member
from what i can see some of these 12v led lamps will run from AC or DC. They have a rectifier on the input so AC will be rectified to DC and a reverse polarity DC will be put right. then there is a DC-DC converter and if I remember correctly the lamp will run from something like 6-30v
 

captaincaveman

Regular EF Member
Cheers guys.
Sounds like forgetting drivers then I guess... I was under the impression LEDs damaged transformers or the bulbs and they needed drivers.

I'm not keen on LED technology. It seems fickle with a lot to be ironed out still. There's so many brands out there and hard to know which are reliable (I'm still waiting 25000 hours to see if one will last that long) and then you have to throw drivers and dimmers into the mix (and don't start me on LED dimmers!) o_O
 

davesparks

Forum Mentor
I'm not keen on LED technology. It seems fickle with a lot to be ironed out still. There's so many brands out there and hard to know which are reliable (I'm still waiting 25000 hours to see if one will last that long) and then you have to throw drivers and dimmers into the mix (and don't start me on LED dimmers!) o_O
LED technology is pretty sound, it's the way it is used/applied that leads to problems. Trying to make new technology like this work identically to old technology doesn't work.

An LED light fitting which is designed specifically for LED from the outset with the correct cooling works very well. An LED and driver circuit squashed into an existing lamp package such as GU10 which was designed for something which needs to stay hot to work properly is never going to work as well.

Dimming LED is also very reliable if you design the system to work with the technology rather than trying to force it to work with old methods. Feeding an LED driver circuit with a dimmed supply is never going to be perfect because you are giving the electronics which control the LED a chopped up or reduced voltage to power them. Drivers which have a permanent supply to power them and a seperate control signal input are the way to go with LED, this doesn't have to be anything fancy, simple 1-10V control is fine.
 

Electrician Talk

Electrical Forum

Welcome to the Electrical Forum at ElectriciansForums.net. The friendliest electrical forum online. General electrical questions and answers can be found in the electrical forum.
Electrical 2 Go - Electrical Supplier and Electrical Wholesalers
Electrical Insurance
Top