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 The spectum of the colour blue is perfectly suitable for the growing periods of the plants. The stems get big and strong, the Photosynthesis is being stimulated and helps a heathy and strong growth. The spectrum of the colour red, gives a full and sumptuous bloom formation which makes every friend of plants happy. Available in 125 and 200 watt version. For the great success, the right choice with small energy expenditure. A growers report CFL-lamps (ESL-shining means) I use a greenbud Double-Power for germination, growing phase, mother plant and cuttings. A pachsurface of 70*70 cm is lit up. The past results to the consequence I would think, that 90*100 cm should also be no problem. It is important though, that the cabinet insides absolutely necessary are painted with white reflecting colour (latex colour-shining). That´s how a good luminous efficiency and distribution is reached.. The plants grow normally without “aspargusing”, Even at a distance of more than 30 cm.. Full green colour, more strongly sprouted and sidefloated plants with healthy leaves. The plants look strong and smell really delicious. A big advantage over the NDL is the low heat development. Air humidity doesn´t need to be regulated. Be cause plants don´t evaporate that much water. It almost seems that this CFL is as made for my favourite plant. For the flowering period a single CFL is also suitable. It doesn´t radiate with the lumen achievement of an NDL lamp but the results are exemplary. The significant advantage is A substantially longer life span during constant light achievement.,as to the NDL which lose about 50% of their original achievement after 1 year of continuous operation. Despite a small fault I would give the CFL (also called EFL) the school note “very good”. Straight therefore if the electricity costs for the time of growth are being compared to those of an NDL. The cost of electricity saving exceeds the higher initial cost. Example for calculation of electricity costs: CFL-lamp;12 weeks-growth period:of 18 hours a day with 170 Watt and about 16 cent/Kwh=41,13€. With an NDL (400 Watt) it would be 96,77€. As a result Per: lower heat emission, long life span, no additional fluorescent lamp ballast, small current consumption, no power loss. Vresus: high initial costs.