So, overall, Lucids ‘marketing points’ and ‘blue dot’ as to why to choose ‘blue’:

1. “Blue is the fastest transmitted color in the spectrum.” : moot …because the human eye can not perceive a difference in ‘transmission’ speed between blue or any other color at the close distance of the dot.

2. “The Human eye is more sensitive to the blue wavelengths than any other in the spectrum.” : The human eye is is ‘more able’ to see blue light IN LOWER LIGHT CONDITIONS (and not all light conditions, thus also a moot point for daylight use) (explained in post above this one). But this is not really ‘sensitive’. Perception in the eye-brain combination is what ‘sensitive’ to light, no matter the color, is – the ability (i.e. more able) is not the same as ‘sensitivity’ and perception. Green is still the dot color the human eye is more sensitive to than any other in the spectrum. You want to be able to perceive, not just ‘be able’…. heck, even blind people ‘are able’ to detect light, just not perceive it. But anyway, overall this is a moot point and not a real reason just to choose ‘blue’ ’cause they say this.

3. “Blue illumination presents a clean edge reticle.” : No. just no. (explained in post above this one)

4. “Blue is the most easily refracted wavelength by the human eye.” : don’t get me wrong, I’m not trying to slam Lucid and in fact I have a couple of their sights and they work fine. But who ever wrote this line doesn’t understand that you do not want refracted light in a dot sight. And the fact that such light can refract in the human eye is the very reason why you do not want refracted light in a point light source like the dot in a dot sight. Plus, light refracting in the human eye has nothing to do with being able to perceive one color better than another.

5. “Blue Creates a “Circadian” rhythm, calming the human mind.” : No, see post above this one. But is there a calming effect from ‘blue’? Yes there is, but it does not happen with a point light source of the size of the dot in a dot sight.

6. “Less than .02% of people have a color blindness to Blue.” : hmmmm… this needs some qualification to understand. Its actually a blue-yellow color blindness, of which there are two types…Tritanomaly – People who are color blind in this way have an impairment in blue cone pigment function. Blue shows up as green, and there’s difficulty differentiating between pink, orange, yellow, and red. — and — Tritanopia – People who have tritanopia don’t have blue cones. They can’t tell the difference between these colors: Blue and green, Purple and red, Pink and yellow, and it also makes (all) colors less bright. IF a person can not see just blue there is a different issue that is not color blindness.

7. “Blue, as an illuminated aiming point, can be reduced in brightness level allowing the reticle to be “Seen Through” providing a more positive target identification.” : Hmmm, so can red and green.

What Makes the Blue Reticle so Special?

• Blue is the fastest transmitted color in the spectrum.

• The Human eye is more sensitive to the blue wavelengths than any other in the spectrum.

• Blue illumination presents a clean edge reticle

• Blue is the most easily refracted wavelength by the human eye

• Blue Creates a “Circadian” rhythm, calming the human mind.

• Exposure to blue light considerably reduces stress levels.

• Less than .02% of people have a color blindness to Blue.

• Blue, as an illuminated aiming point, can be reduced in brightness level allowing the reticle to be “Seen Through” providing a more positive target identification.

Well, most of that is marketing BS, but in reality…

basically, in plain English and not science’ese – and because of the term ‘sensitive’ being used and can be applied in different contexts;

The human eye is ‘more able’ to see blue light in lower light conditions because the eye pupil opens more in lower light conditions thus, basically, more rods (basically light receptors) are ‘exposed’ and the rods contain a chemical (melanin) that is sensitive to blue light wave lengths but not other color light wave lengths. (note: this has nothing to do with human eye night vision ability). Blue light is also ‘transmitted’ faster than green light but the difference is so small that its not really perceived as a difference by the human brain-eye connection even though in some causes the eye may react quickly to some degree, but mathematically its about 1 part in 100,000. Blue light exposure provokes more of a photochemical reaction in most eye tissues, in particular the cornea, the lens, and the retina, than other light colors, this also is part of the ‘more able’.

The being ‘more able’ could be termed as ‘more sensitive’ in that context, but its not really in actual light perception.

(note: melanin is sensitive to blue light because its the human eye filter defense against harmful blue light radiation. But not all blue light is harmful, only certain wavelengths are harmful and this sight does not use those wave lengths)

In bright conditions (e.g. sunlight, bright room light, etc…) and most low light conditions (e.g. bright moon light, shaded areas on sunny days, dark but ambient light enough to distinguish shapes and/or features) AND for distance the human eye is more sensitive’ to green because the cones (basically the receptors of the light wave lengths of color, there are around 6 million of these in a human eye) of the eye for the Long and Medium wavelengths (L and M – higher red frequencies and green wave lengths) are basically almost equally stimulated. This is actual ‘sensitive’.

So although it could be said, in its context of ‘more able’, “The Human eye is more sensitive to the blue wavelengths than any other in the spectrum.” and there is science to back this up and it is true because of the melanin and that any light of any wavelength hits the cornea of the eye before the cones …. the actual sensitive to light color is still green once the light color is perceived. The difference between green and blue in ‘perception’ and transmission is effectively zero because the human brain-eye connection can’t really perceive a difference when the light source is as close to the eye as it is with dot/scope sights, or at longer distances for the blue. So overall in effect, purpose, and money, and use in context with ‘sensitive’, the more correct statement would be “The Human eye is more sensitive to the green wavelengths than any other in the spectrum.” and a ‘green dot’ sight would still be better.

So overall ‘blue’ for a dot sight really is not as special as Lucid wants to make it out to be.

“Blue Creates a “Circadian” rhythm, calming the human mind.” – in Jan 2024 research discovered that blue light doesn’t really significantly affect a person’s circadian rhythms.

“Blue illumination presents a clean edge reticle” – actually not, this is simply a matter of how the dot is produced and projected and has nothing to do with the color. In fact blue light not specifically focused has a ‘fuzzy edge’ to it.

“Exposure to blue light considerably reduces stress levels.” …hmmm needs some qualification – the part they are not telling you … blue lighting accelerates the relaxation process AFTER ACUTE PSYCHOSOCIAL STRESS (e.g. an argument), IN COMPARISON WITH CONVENTIONAL WHITE LIGHT. The amount of normal stress reduction depends on body chemistry factors not associated with or affected by the color of light. There are other colors that do the same thing for different people, one of which is green.

“Blue is the most easily refracted wavelength by the human eye” – hmmm…. one of the things you do not want with a dot sight is refracted dot light, holographic sights overcome this issue by use of polarization grating.

“Blue, as an illuminated aiming point, can be reduced in brightness level allowing the reticle to be “Seen Through” providing a more positive target identification.” — hmmm, so can green and red.

Blue light dots appears to some people with an astigmatism as ‘better’ because of two factors – one, the human eye-brain perception and, two, a reaction with melanin in the eye which causes a sort of ‘polarization’ filtering effect and a very extremely slight dimming of vision thus less light entering the eye and helps cut off the light being refracted at different angles which is what causes the various ‘unclear’ dot issues with other red dot colors for people with astigmatism. But this efficacy is not universal for all humans due to differences variation in eye shape and chemical makeup.