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 😊

Specification met	CE
UPC	711639501539
Manufacturer	Lowenergie
Part number	12-3
Item Weight	160 g
Product Dimensions	2 x 4.1 x 9.2 cm; 160 g
Item model number	12-3
Wattage	12 watts
Included components	LED Driver
Batteries included?	No
Batteries Required?	No

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

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