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Re: light tubes

I recall a fairly lengthy discussion of solar tubes on Compuserve.
Richard Harker (if I remember correctly) who has done considerable
testing on the PAR outputs of MH lighting found that solar tubes
provided disappointing levels of PAR.  His conclusion was that they
would not be an adequate source of light for reef tanks.

If anyone's interested I'll see if I can dig up his data or send him an