well, when i upgraded from my 600, to 1000, i wasent sure what to do. still arent, as far as running it at 1100, vs 1000. its just a ten percent boost. its viably brighter. for the most part, i am running plus lumn setting 12/12. mine is actually 1145 on. 1215 off. im taking a break from trimming all this outdoor jack H. i still about 2/3 the way done on the small plant. still have the big one. anyway, back to the bulbs. i really liked the color of the 600 sunmaster. when i bought my new ballast, they had the eye for 95. they have one thats new, and way more expensive. but when this bulbs time is up, im going to a 1000 sunmaster, i really like the way the plants react to them. gives the room a michal meyers halloween orange glow, to. lol. never seen a bulb this orange. they go for 99. commonly. ive heard the cheap bulbs are ok. FOR ONE GROW. after that, they can rapidly, and usually do, lose their light output quality. i replaced the t-5 4' TUBES (
a couple months ago. they were over two years old, and black around the ends. i noticed an IMMEDIATE inprovement in my young 'uns with the new tubes! i love this light. i can turn on 4 at a time. and for shits and giggles, 2 of the 8 new bulbs, i made the orange spectrum. the other 6 are 6500k. i think the sunmaster, is a low 2700k,while many others are like 3000-3100. the shame, is my yield has not gimproved over the 600 watt. ODD! in march, my carbon filter will be 3 years old come march. still going strong.