light frequency is measured in kelvins (K) the higher the K the more into the blue you go. a normal lightbulb was 3000K, the "super white" you see in most LED's now is around 6000K.
but thats all they produce while halogens etc are white they also range into the infra red to the UV. i have found especially on rabbits its the infra that gets you the startled "look into the crosshairs"
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