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uh.. red isnt really invisable, but it doesnt really effect them a whole lot. its good for "night time viewing" when nocturnal geckos are out, however, i find they are too bright for me to have on at night, if the cages are being kept in my room. i can tell they are effected by it, because when a red line is shown over them, their pupils arent comepletely open. if you want to invest in something long term, go with a ceramic heat emmiter, for a few bucks more but will last 10+ years. and.. of course, with any heating element, always attach to a dimmer or thermostat.
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