Tuesday, February 17, 2009

Seeing the light

More information is coming out on the Indiana Medical Center SPD installation, in the form of an article on one of REFR's favorite uncritical mouthpieces, glassonweb.com. The article itself is the usual fluff rehash of Innovative Glass's PR on the installation (only notable in that it links to an "original source" in Belarus of all places), but contained within is a picture which for once backs up an old adage by being worth at least as much as the thousand words of the article. Witness SPD in action:

No, I don't know what the inset in the corner is supposed to be, so let's focus on the main picture. First question: is this SPD in the light state or the dark state? At first glance it seems to be the dark state, but just look at the sunlight pouring in on the left, from a full room away. This is obviously nowhere near as effective as the mechanical blinds the article naturally denigrates, in terms of darkening a room.

So perhaps it is some kind of intermediate state? But if so, why would they choose such a state to show off, one that is neither effectively light blocking nor resembling of ordinary clear glass?

In fact, it might actually be the "clear" state. Some message board posters have asserted that SPD becomes significantly darker when viewed at an angle, perhaps even the relatively mild angle the photo is taken from. But why would they choose to highlight this "feature"?

Of course, the notion that SPD is "good in theory, not so hot in practice" is nothing new to regular readers of this blog. But it rarely hurts to keep verifying that, no matter what tune the share price might be dancing to, at the company itself, little if anything ever changes.

Update: a commenter has pointed out that the image that appears to be "behind" the glass is in fact almost certainly a reflection of the interior of the room itself. That certainly explains the choice of shot, although this means the only effect being illustrated is that SPD makes it hard to see outside of the room. I suppose they can use the room for focus group meetings or something.