uaerc

Hi

I dont have much choice to get specific bulbs in this part of the world.........so after a lot of research and findings the best i could pick from my market was the Osram 70w MH Powerstar HQI - TS DAYLIGHT...... specs below.

I want to use this for the Glossostigma project i am planning to start soon......tank size will be small - med. mostly in the range of 60x40x40..... Do you gurus out there think that this bulb will do the job? co2 injecting is available (DIY pressurised. FEx. setup), nutrients will be acquired from ADA.

CRI is 85 on the bulb with a 5200k ...... more specs in the attachment.......cheers.

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Vasudeva

Hi, this is a great post i have learned a lot, but i am just bit confused on kelvins and nanometers. can i have a bulb with 10,000k and still have a spike in 650 nm? where do Kelvins and nanometers come together? are kelvens just measuring what color i see? thanks for the great informational post!

defdac

Yes, that is correct. To have cooler, bluer, colors (higher color temperature) the blue part of the spectrum needs to be relatively higher than that red spike though.

When you heat up an idealized piece of matieral known as a "black body" it will emit different colors depending upon it's temperature: http://en.wikipedia.org/wiki/Black_b...ody_simulators

The relation between kelvin and the spectral distribution colors (nm) is a bit complicated. You can calculate the kelvin from a spectrum, but not the other way around since many spectrums will generate the same color:
http://www.fourmilab.ch/documents/specrend/

Shad0w

Totally lost
I was always thought that color temperature (kelvin) based on the combination of R, G, B spectrum. Depending on intensity of each spectrum you have different kelvin.

Now If I understand you correctly, you can get the same kelvin with different R, G, B intensity combination. How could that be? By the way your link is way to heavy for me.