I found out this morning that the light over one of my terr.s has burned out. It is an 18" under-cabinet fluorescent light. My question is: What kind of light bulb should I replace it with? It says it was a cool white, and I think the plants in this terr. grew better than the ones in the terr. whose light claimed it was an aquarium/plant light. The plant light was dimmer and purplish, where this one was brighter and looked fairly balanced (to me). So should I replace this one with a cool white, a warm white, or what?

Thanks,

-Jmcat