I used GE Chroma 50 lamps, multi-phosphor 5000K daylight balanced flourescent lamps, for the last 23 years for judging both color and B&W prints. They have a CRI (color rendering index) of 90. I recently found Phillips C50 Colortone tubes in a local home center, which are 5000K and have a CRI of 92, to replace the failing GE lamps. These have more phosphors for a more continuous spectrum and a better match to daylight. You can get filtered filament based lamps as well, but the ones I have seen online are much more expensive. They have the advantage of a true continuous spectrum.
I have seen advice recommending that you judge prints under the same lighting conditions that is to be used for display; good advice for prints you know will be displayed in a particular setting. However, for a combination of both color and B&W printing, I have settled on high CRI 5000k flourescents, some of which have up to 7 phosphors and CRI ratings of up to 96. The "D50" designation is one clue that you're getting a real daylight balanced lamp, as opposed to the misnamed "daylight flourescent" that often has a color temp of 4100K or is missing a strong red phosphor, and has a much more discontinuous spectrum.
I'd do a Google search on CRI and flourescent to see if you can find some brands and suppliers in Aus that have high CRIs at 5000K. Phillips and others also make smaller E27 base D50 lamps that you might find useful over an inspection area. These will screw into a regular light bulb socket. Note that you can have high CRI ratings at color temps other than 5000K (often in the 6000K-6500K range), but you want a combination that's in the 5000K-5500K range with a high CRI; 90 or above. The maximum CRI is 100, indication a power spectrum that exactly matches standard noontime daylight.
Lee
