Will this work for GU10

Sorry, I cannot answer for Certain because your question is not specific enough. I purchased mine to drive 12V GU5.3 50W Bulbs. Providing your Bulbs are of 12V nature and do not exceed 50W Power rating, they should be OK. However, if the wattage is TOO low it may not draw enough current to allow the device to regulate or even work at all. If they are 30W or 50W as mine it should be OK.

What are the actual product dimensions? Shown on web page as ‎27 x 19.5 x 18 cm, which can't be right!!

Elsewhere on page it says: Dimensions: 21mm Height x 30mm Width x 120mm Length The supplier could do with correcting the wrong data you have highlighted

How many 20w lights will it run? I've got 5 out due existing transformer dying.

It’s rated for 20w to 60w, therefore you could run 3x20w.

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National Lighting 12V Transformer - Low Voltage 20W – 60W Rated Electronic Dimmable Transformer for Halogen Lights Lamps Bulbs IP20 Rated

National Lighting 12V Transformer - Low Voltage 20W – 60W Rated Electronic Dimmable Transformer for Halogen Lights Lamps Bulbs IP20 Rated

Product ID: 56617762

Details

Brand
National
Mounting type
Surface Mount
Power source
AC/DC
Product dimensions
3D x 12W x
Specification met
CE

⚡60W max power output

🔌Pre-terminated cables for quick install

🛡️Thermal & short circuit auto shut-off

12309CFA

Duties & taxes included

In stock

Sold byAmazon SenegalDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

⚡ Power your space with precision and style — don’t get left in the dark!

SMART SAFETY SHUTDOWN - Auto thermal cut-out and overload protection keep your space safe and sound.
COMPACT SLEEK DESIGN - Slim 21mm height with a modern black finish fits discreetly in any setup.
RELIABLE PEACE OF MIND - Backed by a 2-year warranty and CE certification for trusted performance.
SMOOTH DIMMING CONTROL - Compatible with most resistive and inductive dimmers for perfect ambiance every time.
EFFORTLESS INSTALLATION - Pre-terminated 240mm & 250mm cables make setup a breeze for any DIY pro.

The National Lighting 12V Electronic Dimmable Transformer delivers up to 60W of low voltage power, optimized for halogen lamps with smooth dimming capabilities. Featuring pre-terminated cables for quick installation, built-in thermal and short circuit protection, and a compact black design, it’s engineered for safe, reliable, and stylish lighting control in dry indoor environments. Certified CE and backed by a 2-year warranty, it’s the smart choice for modern lighting upgrades.

Specifications

ASIN	B071WWDLDW
Best Sellers Rank	1,967 in Lighting ( See Top 100 in Lighting ) 13 in Low-Voltage Transformers
Brand	National Lighting
Country Of Origin	China
Customer Reviews	4.5 4.5 out of 5 stars (774)
Global Trade Identification Number	05016087923403
Item Dimensions D x W x H	3D x 12W x 2.1H centimetres
Item Type Name	Black Finish 12V Low Voltage 20W - 60W Rated Electronic Dimmable Transformer for Halogen Lights Lamps Bulbs IP20 Rated
Item Weight	0.09 Kilograms
Manufacturer	National Lighting
Manufacturer Part Number	ET60R
Minimum Frequency	50 Hz
Model Number	ET60R
Mounting Type	Surface Mount
Number of Items	1
Number of Packs	1
Power Source	AC/DC
Product Warranty	2 Years
Specification Met	CE
Unit Count	1.0 count

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