Does anyone know of any T8 tubes that cover about the 10k range? most ive found are 6500k providing no red spectrum at all, or 18,000k and provide too much giving me algae problems, (brown, GSA).


Ive retested my earlier experiments with lighting colour now my CO2 is stable and therefore, comparible. Ive found that running 2x 6500k and a 18,000k produces no more pearling than running 3x 6500k tubes, under the same conditions.

Im not overly sure why that would be, you would think that the tube with more red spectrum would lend the plants to photosynthasis at higher rates.

It seems like those 2 statements would contradict eachother, but I do find that the algae prefers the 18,000k even more than the plants seem to.