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[MikeT]

Using strip board (where each column is one long track) I want to mount 4x 3v LED's in series to connect to a 12v supply as in the diagram below. (Obviously, there will have to be a link from the +ve & -ve power tracks to the start LED and end LED.)

= is track
O is hole in track

===O=== (12Vdc +ve)
===O=== (LED1+)
===O=== (LED1-)
===O=== (LED2+)
===O=== (LED2-)
===O=== (LED3+)
===O=== (LED3-)
===O=== (LED4+)
===O=== (LED4-)
===O=== (12Vdc -ve)

Now, if I create another column (or more) of 4x 3v LED's, do I need to cut the tracks in between or is it not necessary?

===O===O===
===O= =O===
===O= =O===
===O= =O===
===O= =O===
===O= =O===
===O= =O===
===O= =O===
===O= =O===
===O===O===

I hope you can understand my drawings and thanks for looking.

[MikeT]

I can answer my own query now.

No, I didn't need to cut the tracks. Just link the rows of 4 in series and the 3 columns in parallel.