Tonight the sky is very clear over Amsterdam, with an almost full moon shining om my balcony (as photographed above through binoculars). Which gave me the opportunity to try something that I was pretty sure of that it would not work: recording a moon spectrum on my handheld spectrometer.
The minimum illuminance that it can record a spectrum of is about 10 lux. So I concentrated the light with some cheap plastic magnifyer and behold, it worked. The projection of the moon on the sensor was made as sharp as possible and was a bit smaller than the sensor surface of the spectrometer, so I think that chromatic abberations of the magnifyer were reasonably averaged with the rest of the light by the diffusor of the sensor so I rather trust that it is an accurate spectrum of the moon as it shines over Amsterdam tonight.
So here it is, how fun is that! And no PWM was measured
Hey DJOZZ have you contacted the manufacturer? If there is a group buy I'm in for 2 .
"The Purkinje effect makes us perceive faint light as bluer (higher colour temperature) than we would perceive a brigher light with an identical spectrum"
<< this may explain why Hi Cri lights look much better on med. or high compared to low or moon modes.
It would be nice if LED light bulbs came in 4250K with 98 CRI. That’s pretty much perfect for both indoor and outdoor lighting. I generally never see anything between 3000K and 5000K in stores though, so I have to mix multiple bulbs to get the right temperature.
First, djozz, super cool to know this. Like others, I would have thought it cooler as well.
TK, not sure if you have a Rural King in your area, but I just picked up a couple boxes of ‘Tool Shed’ brand LED bulbs rated at 4000K. Cheap brand, I’m sure, but I surprisingly liked them so much, I picked up an extra box and replaced all my basement bulbs with them. They are ‘just right’.
That sounds like a wonderful thing to do.
I do have a jar big enough, but how to push the button while the spectrometer is inside?, sure the moonbeams will try to escape if I keep the lid off.
The ambient light from the moonlight is so dim that you are using your rod cells, not your cone cells, hence you are not perceiving that the ambient light is in fact warmer/yellower than the ambient light under sunlight (light of the sun + light from the sky (blue)).
As others have said, I’ve always found this to be the sweet spot for CCT at night time and roughly 3B tint for daytime (about 5200K). The latter is apparently the CCT at sunrise/sunset … It’s always cool to see these preferences and ‘attractions’ be correlated to things in nature.
I've heard Jon Slider talking about this too and have problems understanding people talking about using flashlights during the day ...Just makes no sense to me .If i use a flashlight in the day it's for 11 seconds to find my pen that fell behind the stereo speaker.tint isn't an issue at that point . where do people use a light in the day ?
