Two rounds were done also to test flowering. CFL 180W 2100K SON-T Spectrum lamp (with integrated ballast) was hung vertically for kind of “vertical screen of green” setup. Footprint cca 60x60 cm.
Afghanica strain from Flying Dutchmen (now nonexisting seedbank, later acquired by Sensi Seeds). Yield of this phenotype is usually above average.
Sorry for missing photo of whole setup, there are 8 plants around the lamp Sea of Green style, switched to flowering at 30 cm height (finished 60cm tall). Plants are in coco, fertilized with Biogreen (mineral based nutrient)
Buds are kept away from lamp using screen. At 5-10cm from the lamp I measured 40.000 lux
Resulting yield was 90 grams.
Summary: Usability for Flowering Phase
CFLs can’t match lumen output of HPS lamp at the same watt output. But they emit really low levels of heat which makes it suitable for limited space closet grows (specially in vertical setup).