Lamp, the ‘UFO Building” at Night. Mare Island Naval Ship Yard, California. February 12, 2011. © Copyright G Dan Mitchell – all rights reserved.

A lamp casts a shadow in bright artificial light in a night photograph of the wall of the ‘UFO Building’ at Mare Island Naval Shipyard.

The first time I photographed the side of this weathered and peeling building and Mare Island Naval Ship Yard, I didn’t see the feature that gives this building its informal name. I’ll be that you can though, right? Due to a lucky alignment of this small exterior lamp (which appears to be non-functional) and some nearby sodium vapor lamps, the lamp casts a shadow on the corrugated wall of the building that has a striking and easily recognized shape!

It may not immediately be apparent that this photograph was made at night in very low light. However, a look at the lighting should make it apparent that this cannot be daytime light. Note that the lamp that creates a shadow to its right… is also getting some nice illumination from the right side! One of the fun things about shooting in an industrial location like Mare Island is the amazing mixture of lighting sources. Though it wasn’t much of an influence on this night, the full moon can provide light that is color balanced pretty much like daylight… only a lot dimmer. The sodium vapor lamps that light this area (they are common in street lamps) produce a strongly yellow or yellow/red light. Occasional fluorescent or tungsten lamps provide yet more color variations. In the end, it is just about impossible to say what kind of color balance is “real” – and doubly-so since the actual shooting conditions are near darkness. The only reason that images like this look daylight-bright is because they are typically the result of long exposures. In fact, this one was relatively short at just over a minute. Somewhere in the 2 to 5 minute range is perhaps more typical.

The crazy lighting is apparent in this image if you look a bit more closely. As mentioned above, there is cross lighting here from both sides of the frame. While the strongest light comes from the left (and creates that UFO shadow) there is also significant light from a bit further away to the right. You may also be able to see that the in some areas the shadows created by light from one side are filled in by garishly colored lights coming from the other directions – see some of the very yellow areas along the sides of vertical boards and along the ridges of the corrugated wall.

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