After a year of led ,,,, not one person has published any data. Does that tell you anything, after 30 years of the same old hps an hp , and the low life florsents.
Now the compaq florsents , well , cost per lumen over 3 months is out of this world.
The old fashion 18,24,92 in still are top producers of the watts in the florsents. NOTE even then you replace the bulbs every 3-4 months.
Please note the cpf surface to plant in not very much. Refledtion and bounce cost 6-15% per surface ,,,, that amounts to alot of losses. NFG at best