OP
Engineer54
Ok lot of posts on this...12v transformers provide a variable current to 12v halogen lighting.....led drivers provided a set constant forward current to led lighting. now if you use a electronic or wire wound transformer, the leds will run to the max current limit, and usually burn out. By using a constant current driver we can limit this to the leds by usually using a 180ohm resister in each led fitting we can keep the current constant to the drivers limit. And the current will be constant to each led fitting....now voltage has no relevance here at all as long as it is above 1.2v per led or 12v above the light fittings multiply led arrangement ...so its output could be 50v and all would work fine
The shopkeeper must be lucky then, it's been almost a year now since i converted his shop fittings and he's only had to replace (or should i say i had to replace) 2 or 3 lamps so far. These fittings are on from 8am to 9.30pm 7 days a week.
I can see you're point though in the forward bias/constant current. How reliable are these LED drivers as a matter of interest, i've been getting some mixed reviews on them to date??