Kodak recommends using Cool White Deluxe fluorescent bulbs. Specifically they say a bulb that has a temperature of 5000K 1000, color rendering index of 85-100, an and illuminance of at least 538 lux. If you want a mixed lighting condition, add a frosted 75 watt tungsten bulb for every pair of fluorescent bulbs. If you have an incident meter then you can use the EV function to measure the lux, or a reflectance meter and gray card as described in this Kodak publication.

Of course, there are some very expensive light bulbs specifically for judging color prints. They are nice, but pricey.