Hi Sharon,
In a paleontology museum, you may find that some of your galleries are more purpose-built and relatively static-but please correct me if that's not the case. If so, it can be helpful to think about a range of lighting conditions. For example, some rooms might benefit from a higher, out-of-the-way track grid (around 20'), while others may call for a more intimate setup with something closer to a 12' grid. The distance of the track from the walls and the coverage across the center of the space are important factors as well.
I may be in the minority on this, but I tend to avoid integrated solid-state fixtures. I'm not fond of the idea of replacing a $350 fixture when the LED begins to yellow or degrade. I much prefer systems where the lamp can be replaced independently-keeping things fresh with a $25 lamp rather than discarding the whole fixture.
I also generally steer away from dimmable systems. In my experience, they introduce another component that can fail. I have at least one gallery with a temperamental, occasionally flickering dimming system to prove it. Instead, we often use simple metal window screen from the hardware store to cut light levels. It works surprisingly well and is very reliable.
Lastly, consider using tight beam angles. We use Soraa lamps with a 9° beam spread. With their snap-on lenses you can widen the spread or shape it-oval, square, etc.-which gives you a lot of flexibility. Tight beams are especially helpful with high ceilings. Even at 9°, a fixture mounted at 30' tends to read much closer to a 60° spread by the time the light reaches the object.
Steve Rosen, who is in this community, would be a great person to talk to. Please reach out any time and best of luck!
Matt
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Matthew Isble
Exhibit Designer & Founder of MuseumTrade.org
misble@crockerartmuseum.orgCrocker Art Museum
Sacramento CA
misble@crockerartmuseum.org------------------------------