Use a flexible desk lamp with a 5,7 watt,6500 K, LED spot light
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Something like IKEA Tertial or other desk/work lamp with a standard LED or CFL E27 bulb.
I have cookie jar tank and I just have a desk lamp with 23 watt 6500k cfl bulb. Everything grows great in. I have pearlweed, rotala, java moss and java ferns in it.