the one thing i noticed right away when i went from t5 to COB was that my plants looked like hell almost immediately. there is a huge change to the plants and you have to dial them in. the nutrients are different and the height of the light is WAY different. i had to raise my nutrients quite a bit, especially cal mag and i had to raise my lights a lot. i usually run tight to the light as i can without trying to heat stress things. you CANT do this with the intensity of COBs. i had droopy sad looking plants and i was questioning my investment a lot. i finally dialed them in and raised my light to about 2.5-3 feet above and they are the happiest i have ever seen. dial you shit in and you will reap the rewards. start by raising your lights more than you would think and upping the nutes a little. the first picture is after i started using the COBs. the growth rate was great but they looked like shit. i dialed in my nutes again and raised the light up and now the second pic is what i open my tent to every day
big difference in a few weeks. 
i just flipped these into flower. still under the 6500k veg rig i built from cobkits. i was in the same mindset as you. with my t5s i run inches away with a fan on the bulbs and get great results. these i have to raise way up and im only burning ~300w! the difference in heat alone between these and a t5 is amazing. it will blow HID out of the water heat wise. i cant to not have to worry about frying my shit.
TreeMan asked about cri and kelvin, i askthe same thing.post: 13342034 said:
lots to lose when you have old chips that nobody wants. inventory is a losing game in a falling price chip market.i maybe sell 10-20 1212s for every 1825 i sell, despite the 1825s being more efficient. sitting on chips for a year to ultimately sell them below cost is not sustainable
for B drivers, pot value = 100k/number of drivers. so for two hooked up together use a 50k, 33.3k for 3, etc.Great video on how to make the frame.
I have 2 drivers, anyway to hook up a single potentiometer to control both drivers at the same time and a single 3 prong outlet so that the whole unit acts as a single light? Would be nice to have 1 plug and 1 cord.
I will take many pictures when I get started to help out future noobs
looks like your typical shock from ramping up the light suddenly. but yes, less is more! im amazed the results i get with 20-30W/SFthe one thing i noticed right away when i went from t5 to COB was that my plants looked like hell almost immediately. there is a huge change to the plants and you have to dial them in. the nutrients are different and the height of the light is WAY different. i had to raise my nutrients quite a bit, especially cal mag and i had to raise my lights a lot. i usually run tight to the light as i can without trying to heat stress things. you CANT do this with the intensity of COBs. i had droopy sad looking plants and i was questioning my investment a lot. i finally dialed them in and raised my light to about 2.5-3 feet above and they are the happiest i have ever seen. dial you shit in and you will reap the rewards. start by raising your lights more than you would think and upping the nutes a little. the first picture is after i started using the COBs. the growth rate was great but they looked like shit. i dialed in my nutes again and raised the light up and now the second pic is what i open my tent to every day
regardless of what light you use there are max and min light levels the plant can take. my first cob run they were sucking nutes like crazy, suddenly the rockwool cubes i used for years werent enough as they literally couldnt feed them fast enough. there are a lot of factors including metabolism, respiration rate, etc. if your plant is struggling to keep up it will stress. in this case it just identified a limitation, so now i grow big beautiful roots before i get near flowering and they are all happy again
