[APD] Re: Actinics and other things to darken (or lighten) your life

["Tom Wood" <tomwood2 at flash_net>]

"The biggest problem wtih actinics is the lack of output, unless 
you'ave got too much light already, then swapping to an actining 
can help things seem to clean up."

Yeah, this is the effect I'm looking for. I've seen 'dark' tanks 
with actinics on them, so I guess my question is, is that big 
blue spike in the spectrum really growing anything in a 
freshwater planted tank? When you say 'lack of output' are you 
talking about visible brightness, or PAR (photoactive radiation)? 
I'm thinking now of not adding it, but replacing one of my 6700K 
or 5000K lamps so the overall effect would be darker in 
appearance, but still wanting to keep PAR at the same level.

TW 


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