Quote:
Originally Posted by BlackArcher101
I was initially going to reply about the RFP for LED's in Calgary with a remark about how I don't like the Lethbridge lights, so maybe best I do now.
I visited Lethbridge over the holidays and noticed the LED lights right away. For some reason, I had a real hard time with glare as if the actual light itself was a flashlight being pointed at me. They seem to be dimmer in lumens but have less spill light towards the side though and didn't light the driveway/house with a visual cutoff point. This is what confuses me though. With what appears to be less light spilling to the sides, why did I have a hard time with glare? Used to be able to shovel the sidewalk/driveway with the existing lights giving off plenty of light, but this time I was forced to turn on the exterior house lights.
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Glare from your car, or from walking? Glare is basically the ratio between a point source in your periphery to the ambient light. So you would expect a lot of glare to drivers if there is a lot of light in the 70-90 degree angle from the pole. For pedestrians the light in lower angles will result in more glare. As you said, though, there's very little light trespass, so glare shouldn't be too much of an issue. The lights that were installed have a pretty low glare rating, so I'm surprised to hear about glare issues. As you said, the lumen output is lower for these lights as well, so I wouldn't expect to hear much in the way of glare. Typically comments from residents has been 10:1 in favour of positivity, so you may just need to adjust to the white light.