Are these constant voltage drivers?

I do believe they are but I am not an electrician so I can only comment on what I read and perceived them to be

Can you use with led light which come in rolls

Not for the whole roll only small parts ie 300mm or so

Two green inputs, two red inputs. No diagram. Which input is which for the 240v in and which for LED out?

It is clearly marked on the case ! AC 240v in on the right, 12 DC out on the left.

How do i fit these led transformers to the live feed to the light> i have halogen transformers which came with cables fitted. d

Pull out Fuse or turn OFF circuit trip switch so you are safe. See if you can simply undo cable terminals of existing transformer and simply replace with new LED driver. If not cut cables both sides and strip insulation etc. to connect a) mains side to Primary AC 240v and b) lamp holder side to Secondary 12v DC change lamps, put on covers etc and you are done. Replace Fuse/ trip back ON. Bingo 😊

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LOWENERGIE LED Driver Power Supply Transformer, 12w 240V - DC 12V, for Light Strips, LED Bulbs and Ring Doorbell (3)

LOWENERGIE LED Driver Power Supply Transformer, 12w 240V - DC 12V, for Light Strips, LED Bulbs and Ring Doorbell (3)

Product ID: 67691407

Details

Brand
LOWENERGIE
Current rating
1 Amps
Mounting type
Wall Mount
Power source
Mains current
Product dimensions
20D x 41W x

⚡12W max power output

🔌100-240V AC input range

🛡️Built-in multi-layer safety protections

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Description

💡 Power your space with precision and zero flicker—LED lighting, perfected.

PLUG PLAY READY - Perfect for LED strips, bulbs & smart doorbells—upgrade your space effortlessly
COMPACT POWERHOUSE - Slim 20x41x20mm design fits anywhere, even tight spots
SEAMLESS LED UPGRADE - Eliminate flicker & buzz for a flawless lighting vibe
ROCK SOLID RELIABILITY - Advanced circuit design with overcurrent, thermal & short circuit protection
ENERGY SMART EFFICIENCY - Cut your lighting energy use drastically with low standby loss

The LOWENERGIE LED Driver Power Supply Transformer converts 100-240V AC mains power to a stable 12V DC output at 12W max, ideal for LED strips, bulbs, and compatible doorbell systems. Its compact form factor and advanced safety features ensure easy installation in confined spaces with reliable, flicker-free performance. Designed for energy efficiency and durability, it’s the smart choice for upgrading from halogen to LED lighting.

Specifications

ASIN	B07D18VM9J
Best Sellers Rank	9,742 in Lighting ( See Top 100 in Lighting ) 69 in Low-Voltage Transformers
Brand	LOWENERGIE
Current Rating	1 Amps
Customer Reviews	4.5 4.5 out of 5 stars (1,691)
Included Components	LED Driver
Item Dimensions D x W x H	20D x 41W x 20H millimetres
Manufacturer	Lowenergie
Manufacturer Part Number	12-3
Maximum Frequency	60 Hz
Minimum Frequency	50 Hz
Model Number	12-3
Mounting Type	Wall Mount
Power Source	Mains current (AC)
Specification Met	CE
UPC	711639501539

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