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Re: [APD] Alternatives to watt/gallon rule
Andrew McLeod wrote:
> On Mon, 19 Sep 2005 22:43:28 +0100, Jerry Baker <jerry at bakerweb_biz> wrote:
>> I have often wondered about applying an infrared blocking film to a
>> shield in extreme cases of MH lighting heating up a tank.
> Probably a really, really bad idea BTW...
> Firstly, the 'heat' that seems to come from a bulb may not just be infrared radiation - all radiation (including visible light) will warm things up if they absorb it (i.e. they are not white/reflective).
> Secondly, if MH's do put out a fair amount of infrared, then an infrared filter will have to absorb all of that radiation - as heat. So if it's enough to warm up your tank, think what it will do to a little bit of film...
I believe the film reflects infrared rather than absorbing it. My
understanding of electromagnetic radiation is that the energies
associated with far-infrared happen to correspond with the range of
energies separating the quantum states of molecular vibrations. The
result is that absorption of infrared radiation results in molecular
vibration, i.e. heat. The absorption of visible light by matter is
associated with elevating electrons to higher quantum states - something
that does not translate into molecular vibration.
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