I agree the good fixtures using the proper leds are not cheap up front, but in a long term setup, they will more than pay for themselves. Typically in a couple years or less depending on your bulb replacements.The best LEDs to grow plants right now are 3 watts per diode. They're expensive as heck too. The T5 is the way to go.
Unless you prefer the led night light to be in the tank, there are several options that allow you to just stick the leds on an existing light fixture without losing the daylight effectiveness.I actually prefer T5 over the LED anyway I just kind of like the blue night feature but I can add that myself with a submersible led strip.