We believe that it is a misguided trend and false economy. Overseas, independent clocks are available that synchronise to a time code broadcast by dedicated radio transmitters. Unfortunately in New Zealand there are no radio transmitters for broadcasting time code. A rule of thumb is to have a dial size of one metre for every 10m mounting height. Flood lighting is difficult to arrange because the shadows of the hands against the dial become confusing.
Mechanisms are available with hollow shafts so that hands can be fitted with neon strip lights.
Covered dials are economical and practical up to 1m and provide a degree of vandal resistance. Above 1.2m, it is cheaper to expose the hands. Note that high winds, snow or ice may stall exposed hands. Mechanisms are available to automatically correct to time when the ice melts or the wind drops. Will drive up to 450mm dial.