my guess is that it was a water shortage or a temperature flux out of the ideal range of 70 to 80 degrees F during the day/60 to 70 degrees F at night during flowering that did you in, though the plant admittedly requires a ridiculous amount of light to be happy
it is a very fussy plant...if you don't meet those needs, fruit never sets, and flowers will always fall off...
took me a while to figure out i had to pollinate the plants myself indoors for the fruit to set nice too...
14/10 or 16/8 to answer your question though....
depending on the type of lamp you are using, it very well may be throwing your temp out of range...several elevations of readings should be sampled to get a better idea what the plant is really getting
Then the hours of light are fine, they are getting around 15h right now.
Yes, temps were another thing crossing my mind, during the day is a bit too high, around 30ºC (86ºF) and during the night not sure, I didn't check the min-max temps in the hygrometer for a while. Anyway yesterday I improved a little the ventilation and now the temps are down to around 27ºC (80ºF) will keep an eye on the temps for a few days
I'm also trying to pollinate the flowers myself, did it more thoroughly couple of days ago so I'm waiting to see the results. Hopefully one of this will be the reason and I'll be able to see some pepers grow. It's been weeks since the plant is growing flowers but all of them keep falling, it's a pity.
Thanks everybody for your replies