Oops... !!
It has been grown under lights (T12 and T5) for many years. It grew not as quickly as many of my other Phrags. Now that it is larger and blooming almost all year long, it is a near 2 windows (exposition south-South-West) shaded with white cloths in summer, but with compact fluos as supplement light from fall to spring. I must say the lights are sometimes on even in summer when the sun refuses to shine. So I give it the max light it can take.
The max temperature in summer is usually under 28 C. Some days at 30 C does not really hurt it though, but I try to give a cool night under 20 C for all my plants. When they are in the growing room, air conditioning keeps the temp. easily at 16 to 19 in summer time.
Winter temperatures were cooler when it was in the growing room (10 to 15 at night, 18 to 22 day).
About water and fertilizer :I usually water first with well water. pH is not the same all year round. Near 7.2 in summer. By now it is between 6 and 6.5. TDS of this water is near 120 ppm. I water again with fertilizer a few minutes to one hour later. I use many types of fertilizer... I use mainly: Daniels (organic), K-lite, Agrogreen... sometimes with Kelpmax or superthrive or other.... I usually add Subculture B or M too... But the water I use for fertilisation is not straight from the well. I "dilute" it with water generated by a deshumidifier or by snow melting (usually 1:1). Fert solution is at 20 to 50 ppm N. I try to keep the TDS under 240 ppm.
It has been grown in bark mix for years, but now it is in rock wool (pieces of quick drain rock wool slab:
http://cityfarmersupplies.com/products/pargro-qd-slab-6x36
And I never care about conditioning rockwool before repotting. Hope this help!