Saw one at a train show, no name brand. Looked on Grainger, prices range $60- $350. Cannot tell what the quality difference is. Maybe there is none nowadays. Fellow modelers have told me that LED ones burn up. Florescent would be good as that is the light we show and compete under. I would say $100 range is fine. Also they rate by dipolar, read the Wiki, still not sure how that affects it, if any for our use.
Any brands, links, pics you could provide would be a help.