How bad is night time light coming from outside?

[Mountaineer370]

In the many discussions about proper lighting for orchids, I have never seen this question addressed. I am a windowsill grower. The best -- and really only -- window I have in my home which would be appropriate for orchids is a south-facing window in my kitchen/dining room. The window itself measures approximately 65 inches wide by 45 inches tall. On the dining table in front of this window is where I keep my small collection of orchids.

I have wondered for a while now whether the security light on the front of my garage is detrimental to the orchids. The garage is detached and sits slightly back from this particular window, but the light, which comes on at dusk and goes off at dawn, definitely illuminates this kitchen at night. My guesstimate is that it is 25 feet from the window. The light is enough that I could come into the kitchen to get a glass of water, etc., without having to turn any lights on. I could hold something like an envelope up, facing the window, and could read it, albeit not easily. I guess it could be compared to the orchids being under the light of a bright full moon, 365 nights a year.

The window has some lace-type curtains that let in enough light that I usually don't bother opening them in the daytime. They don't cover the whole window but rather the bottom half, what they call a tier. There is also a valance which partially covers the top portion of the window.

I have a variety of orchids, a few phals, a couple oncidium types, a small cattleya, and a paph. The ones that like more light get put the closest to the window, and the lower-light ones, like the paph, I position behind the bigger ones. All are growing reasonably well for me, but I'm having trouble getting anything to rebloom. (Well, except for one phal that is currently putting out a weird spike -- a topic for another thread.)

Anybody have any thoughts on whether this night light is a serious enough issue that it could be affecting the well-being of my plants?