Lighting required for Cheato?

[mark]

bulb I'm using now is a PAR38 (integral reflector) 23W, 5000K and is over a 20g, lit 24/7.

Flow through the fuge is about 200gph with a PH for an additional 300gph.

Chaeto goes from about a grapefruit to a basketball in ~3 weeks.

[Snaz]

My chaeto compartment is 12" x 4" x 4" brick. It has a single 15w 6700k CFL and in eight days it turns a pinch of chaeto into a brick. See my build thread for my DIY fuge.

[c_scherer123]

I am surprised this thread is still active. But the answers are very informative - Thank You!
It seems the lower wattage (within reason), and more white/yellow spectrum seem to work best (with notable exceptions).
I have read in other threads that the basic fluorescent household bulbs (usually <6500 Kelvin) have had great success.
I picked up a used 10w 5500K aquarium light cheap from another hobbyist. We will see how it goes when I get my tank set up.

[banditpowdercoat]

FYI, 3000K lights grow Cheato like CRAP!!!. I cant find anything higher in my town. Had a 5500K, but it died. Chaeto was growing like mad with that, now, its shrunk over 3/4. Red Turf algae grows pretty good with 3000K though

[RuGlu6]

Other then trying a lover then 6500k bulb i am out of options.
May be it a chemistry of the water or who knows what but in my sump it will not grow under CF Phillips 6500k.
Thank you so much though for replies guys !