Watts don’t mean much to me...and it depends on the light...i don’t keep track cept when i pay my elec bill...
in a few weeks i hope to be training clones as 8-main plants... at that point, i’ll be able to tell you wattage under 288s, 96elites, and Prawn’s lights.
My lights are managed for intensity (ppfd), i start cuttings at 50 ppfd at tops 24:0, rooted cuttings and seedlings at 100-150 ppfd 18:6 or 20:4, ramping to 300 ppfd by 6th true node, to 600 ppfd by 12:12, to ~1050 as soon as they can handle it (i try to start 12:12 lights at same DLI as veg DLI, but the ppfd increase to do so at 12:12 usually requires a short ramp).
I state both ppfd and lightson:lightsoff hours, cuz i actually use DLI targets to manage time on : off decisions, based mostly on northern Cal/southern Or DLI outdoor DLIs.
https://horticulturelightinggroup.com/blogs/calculators/converting-ppfd-to-dli
https://www.extension.purdue.edu/extmedia/ho/ho-238-w.pdf
Fluent has a great white led growing tool:
http://fluence.science/wp-content/uploads/2016/09/High-PPFD-Cultivation-Guide-9.27.16.pdf
Page 16 is the summary:
View attachment 4343358
You can see my last two grows by clicking links in my sig, the upcoming slapdown (currently in cloning stage) is at
https://www.rollitup.org/t/the-monumentally-epic-knockdown-dragout-take-no-prisoners-slapdown-aussie-high-light-vs-hlg-288.988144/