Bright lights, another headache?

Glare is a wonderful thing; it creates sparkle, glints and artistic flare. On the other hand glare is an awful thing; creating difficulty to see, veiling detail and tiring the eye.

Whether you love it or not depends on the situation, a club compared to the office, relaxing in the sun compared to driving the car. But we have developed measures to try and quantify glare and what the limits should be. UGR, or the unified glare rating, has been around for a long time. No, it’s not perfect. For one thing, how often do you sit, head at 1.2m above the floor, half way along a wall in a rectangular space and look directly across the room. Continue reading “Bright lights, another headache?”

Colouring your thoughts

There’s a lot of talk about colour rendering and colour temperature, and it seems mostly about what the truth applied to LED.

Should it be R using the 8 sample scale (R8), or R using the 14 colour scale (some call this R14)? Doesn’t Ra of 100 compare to daylight, or is it tungsten? Does LED even tell the truth with colour rendering and isn’t there a better method?

Listen to all the hype, even as an expert and it all gets a little confusing. Then add colour temperature and efficiency and well, we might as all well retire down the bar for a glass of Rioja until we can reach a conclusion.

But there is a lot of talk about little differences. In the LED race to get better colour, we have perhaps forgotten the eyes ability to see, or the brains ability to interpret, both of which are more about perception than absolute measures. Continue reading “Colouring your thoughts”