Abandon4093 said:
Not really true at all. Every single kind of light source has it's own spectrum.
for instance, a common bulb is a mixture of red green and yellow, with very little blue. A halogen has next to no blue light and an over abundance of red. The sun has a lot of blue light and so does a computer screen.
Now staring at the sun is a bad idea because of it's intensity, and by comparison, a screen is meant to be stared at and is nowhere near as intense. But the levels of colour in each light source present their own issues. And staring at something like a PC screen causes us to strain our ciliary muscles. It's not the light itself causing the damage. It's the strain of staying on one focal setting (sort of) for long periods of time.
All that said, I don't believe a word of the OP. Especially not when you look at his second post in the thread.
Just looks like someone attention whoring to me. Probably trying to get some sort of badge.
UV rays (and shorter wavelength) aside, it doesn't actually matter what the primary wavelength reflected or given off of a given source is. The interaction between visible light (~200-750nm) do not change a whole lot with respect to wavelength, and certainly not in the eye. Claiming that a given light source is composed of certain colors is a somewhat bad explanation of emission/absorption lines. For example, the sun produces a nearly continuous spectrum of light, while something like a sodium lamp will produce mostly yellow light at ~500nm with some bits of other lines thrown in. Both are yellow, yet according to you, the sun's light would be more hazardous due its chromatic composition (let's say we're looking at it through UV filtering glass). That's simply not true. Within the visible light region, the exact composition of the light doesn't matter in the slightest, nor does the "quantity" of light. In other words, neither brightness or (visible color) composition matters when it comes to permanent eye damage.
Oh yeah, there's actually only very little difference between common incandescent light bulbs and halogen lamps in terms of emission spectrum. Fluorescent lamps (=mercury vapor) on the other hand actually produce UV light (meaning 'bluer' than blue), but the pigments coating the inside "convert" it to visible light. Pretty cool, huh?
