transformer used for 12v halogen will it work with LEDs?

TheGreenFrog

I am replacing the two 12v halogen lights (20w G4 bulbs) in my cooker hood with LED equivalents (12v 1.5w).   I am wondering if the tranformer which supplies the existing lights will work with the LEDs - the transformer outputs 11.5v 3.95A?

TheGreenFrog

I should add that the LEDs have their own drivers built in, apparently.  

On-the-coast

Shouldn’t be a problem. 

The transformer is capable of powering 12v and 2x20w (it appears to be rated at about 45w total)

you need 12v and 2x1.5w

so unless you’ve misstated anything all should be ok.  You’re sure your leds require 12v aren’t you?  That bit about a load worries me a little in the way you’ve worded it. 

Rodders53

As long as they are AC rated LEDs (and not DC ones) they could be fine. 
Occasionally you get problems, though.

I had to change the transformer to a led driver in my bathroom mirror light when I swapped halogen 12V lamps for LEDs.  The LEDs flickered due to too low a load on the transformer  (8 lamps).

WIAWSNB

Worst case scenario is that you'll need to keep one filament lamp in place in order to keep it going.
Chances are it'll work fine. But some trannies need a minimum draw to switch on. A bit like dimmer controls - most standard dimmers cannot handle LEDs.

TheGreenFrog

On-the-coast said:

Shouldn’t be a problem. 

The transformer is capable of powering 12v and 2x20w (it appears to be rated at about 45w total)

you need 12v and 2x1.5w

so unless you’ve misstated anything all should be ok.  You’re sure your leds require 12v aren’t you?  That bit about a load worries me a little in the way you’ve worded it. 

Yes they are 12v.  these are the ones:

https://www.amazon.co.uk/Tagtight-Stainless-Replacement-Recessed-Kitchen/dp/B0F6MVQ8R5/ref=cm_cr_arp_d_product_top?ie=UTF8

TheGreenFrog

WIAWSNB said:

Worst case scenario is that you'll need to keep one filament lamp in place in order to keep it going.
Chances are it'll work fine. But some trannies need a minimum draw to switch on. A bit like dimmer controls - most standard dimmers cannot handle LEDs.

Yes that is what I was wondering.  I suppose I will just need to connect them and see what happens.

Rodders53

TheGreenFrog said:

https://www.amazon.co.uk/Tagtight-Stainless-Replacement-Recessed-Kitchen/dp/B0F6MVQ8R5/ref=cm_cr_arp_d_product_top?ie=UTF8

Those are DC not AC;  they are probably not really suitable for a simple AC transformer feed. 

The range hood can work under DC 12V voltage, with a power of 1.5W and a color temperature of 6500K, which sufficient luminous efficiency.  
New Built-In Driver Solution: The kitchen range hood light bulb is perfectly compatible with 12V DC working voltage

The LED lamp/with driver may be upset, damaged, or not (a diode rectifies ac after all).

Note those are also 6500 Kelvin daylight colour temperature so a very blue light cf a Halogen lamps (2700-3000Kelvin).  One can get g4 12V ac led bulbs but most warn of the flicker possibility and need for a new transformer. Some transformers are happy with such leds though... 

TheGreenFrog

Rodders53 said:

TheGreenFrog said:

https://www.amazon.co.uk/Tagtight-Stainless-Replacement-Recessed-Kitchen/dp/B0F6MVQ8R5/ref=cm_cr_arp_d_product_top?ie=UTF8

Those are DC not AC;  they are probably not really suitable for a simple AC transformer feed. 

The range hood can work under DC 12V voltage, with a power of 1.5W and a color temperature of 6500K, which sufficient luminous efficiency.  
New Built-In Driver Solution: The kitchen range hood light bulb is perfectly compatible with 12V DC working voltage

The LED lamp/with driver may be upset, damaged, or not (a diode rectifies ac after all).

Note those are also 6500 Kelvin daylight colour temperature so a very blue light cf a Halogen lamps (2700-3000Kelvin).  One can get g4 12V ac led bulbs but most warn of the flicker possibility and need for a new transformer. Some transformers are happy with such leds though... 

Thanks - think I will buy a new transformer designed for LEDs and which outputs 12v DC.