first off i know t5s are better, but my friend has a small grow setup and i told him i would research how good his light is. its fluorescent t8 4200k it's either 18 or 30 watts i believe. i will find out later today. but from the given knowledge, can anyone tell me how good this light is? will it be good enough to make it all the way thru harvest?
Not a very good spectrum I don't think and 18W you'll need 6 to grow one plant and 30W you'll need 4 to grow one plant. If that rule even applies to T8's