This morning I temporarily installed the new permanent lighting, and removed the temporary lighting permanently.
Considering the temporary lighting has been in the hold for 10 years it hasn't done too bad. The temporary lighting was 4 12v halogen bulbs, 20 Watts per bulb, the new lighting is 4 LED light fittings, 2 Watts per fitting but equivalent to 25 Watts output each so brighter with less power consumed.
New lighting fitted temporarily but turned off, temporary lights on.
Temporary lights turned off, new lights on.
Temporary lights removed.
As can be seen from the photos then new lights are definitely brighter.