Blueberry, Butter Cream Gelato & Cheese

No Issue with the plants this week but I noticed that my 1000w hps doesn't seem to be as bright as it should be. I am only getting 50k lux at 18 inches. Whereas before I got 100k lux at that height. I checked the ballast and it is still drawing 1000w. I replaced the bulb but that also did not fix it so I am not sure what could be happening here. I am hoping to upgrade to a sf-4000 soon. The buds all look pretty good, a lot of big buds on the blueberry plant but the cheese plant is not nearly as dense as previous iterations of this strain. This may be because of the light issues I seem to be having.