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Re: Osram Dulux L 2G11, 55W/21-840
> I am guessing that they are 840 phosphor
> lamps which means they are thick coat
> high CRI 4000 K lamps. If so, they are
> more yellow than most people like but
> that is up to your personal taste. It
> does not mean they will not grow plants
I'm using General Electric SPX41 lamps, and plants love them. I'll relamp
with SPX50's when these wear out, but you get use to the yellower color if
you do not have a lot of floating plants right under the lamp. When my tank
starts to look dingy, I trim tall plants a little and thin out the duckweed.
I've also found that the 4100K lamps look sparkling white after I polish the
water with a diatom filter. So, some of the yellowish cast is due to
suspended particles and algae scattering the light.
FWIW, I use SPX35 lamps as "grow lights" for starting seedlings in the winter
and the terrestrial plants grow great.