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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
> though.
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.
best regards,
bob