Blu ray actually operates using a violet laser and while blue lasers typically operate at closer to 500nm violet lasers barely make it into the visible spectrum at 405nm.
Red green and blue laser lights.
For example green laser pointers are used for astronomy especially stargazing.
Next yellow and orange lights are typically used in hospitals.
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Easily switch between green red blue green red green blue red blue or the red green blue combination.
The green laser is also used as the laser sight for guns and rifles.
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The red green and blue laser light includes a built in timer running for 2 4 6 or 8 hours.
The included remote allows you to control your laser light from around the house not just close by the light.
In low light however the advantage of a laser becomes quite obvious and under those conditions both a red and green laser will provide an advantage.
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If you re looking for a more exotic laser blue or violet is the way to go.
But just like green lasers powerful enough blue or violet light can be dangerous.