I feel like if i put 2 par 20 5000k led bulbs on my 29 gallon bowfront it would be enough. I also have 1 18" t8 bulb on it think itwpuld be good enough? They are rated 50 watts equevent. Let me know whats up!
Its LED so its mesured in par but runs on 9.5 volts which is equal to a 50w other bulb. So in theory i would have 100 watts on the tank with the 2 lights. So 100/29= 3.44watts per gallon. So i hope this will work out!
LEDs give light in a spot unless you are using a lens to scatter the light. 5.000K doesn't mean much. Plants love full spectrum, unless your LED emits light in a wide spectrum the color temperature does not tell the whole story.
I don't use LEDs myself but AFAIK it is better to use more LEDs of lesser power scattered in your fixture than two lighthouse graded emitters.