Run a string of LEDs from the mains

[falingtrea]

falingtrea: If i use a transformer inside a device then would it make a difference? 240V would still be going into it so i would need to look at all that safety stuff anyway

Which is why most companies buy an off the shelf power supply solution. The power supply company handles the safety issues. If a part already meets UL or IEC standards, you usually don't have to requalify the part when you submit your product that includes the pre-approved product.