I also use that tube.I personally use the 12% desert uvb bulbs http://www.lightyourreptiles.com/bulbs/arcadia/ I only use them the last 2 weeks a few hours a day to simulate high noon
So, I was doing some simplified calculations and I was figuring for 115 watts of LED you should have around 4.6 - 5 watts of UVB to mimic high altitude. However the UVB lights seem to diminish quickly with distance, and am wondering what would be suitable for 18 inches...about 12 inches.. i believe that they will not be effective after 2 feet
Not knowing the size area you have i would approach it like this you have a given area lets say 4x4 and you would like to go with a 18 inch from the canopy I would go with 2 3 foot bulbs one for a 2x4 area. you are only using uvb the last 2 weeks of flower.So, I was doing some simplified calculations and I was figuring for 115 watts of LED you should have around 4.6 - 5 watts of UVB to mimic high altitude. However the UVB lights seem to diminish quickly with distance, and am wondering what would be suitable for 18 inches...
Some bulbs am looking at
http://www.lighting.philips.com/main/prof/lamps/special-lamps/medical-lamps/medical-therapy-uvb-broad-band/uvb-broadband-tl/928011301201_EU/product
http://www.lighting.philips.com/main/prof/lamps/special-lamps/medical-lamps/medical-therapy-uvb-broad-band/uvb-broadband-tl/928034901229_EU/product
I am wondering if the 100 watt would perform better at a distance of 18 inches plus with a narrower band excluding UVA would suffice...
Basically, all my LED calculations are based for 18"... Any suggestions?
Not knowing the size area you have i would approach it like this you have a given area lets say 4x4 and you would like to go with a 18 inch from the canopy I would go with 2 3 foot bulbs one for a 2x4 area. you are only using uvb the last 2 weeks of flower.
Think am going to build one panel 2 rows of LED separated by 2 uvb 54 watts then take PAR, and UV readings at different heightsThis is where a reef dimmer? and a dimmable driver would be useful. Progressively get brighter until midday then start to dim to off.
I've been running CDM for awhile now and I'm changing over to COB LED. Do you have any experience with these?Buds grown under pink LEDs are considerably weaker in potency than CDM buds.
Unfortunately no, I don't have any experience with proper COBs, but I'm considering buying some COB fixtures to use during the summer, probably going with todogrowled.es .I've been running CDM for awhile now and I'm changing over to COB LED. Do you have any experience with these?
I just want to make sure I'm understanding this -- are you saying that you had the UVB light go on 1/2 a day throughout flower until the last two weeks, and then it was on for the full 12 hours per day for the remaining time? Thanks for clarifying.I found that about 1/2 hour a day until the last two weeks then go 12/12 worked quite well, harvest was more normal and potency seemed better.
Yes 1/2 hr a day until last 2 weeks then 12/12 , they don't seem to gain as much weight as without the UVB. It seems worth it.I just want to make sure I'm understanding this -- are you saying that you had the UVB light go on 1/2 a day throughout flower until the last two weeks, and then it was on for the full 12 hours per day for the remaining time? Thanks for clarifying.
I put them about 12" from canopy, replace them regularly for best results( Reptisun 10.0 is what I use )@medicinehuman -- thanks for reply. Its interesting to see how different people go about it. I've read a couple of people say they run them for 4-6 hours a day for the last 3-4 weeks. It seems there is some debate about whether have any impact before flowers really start to develop.
I've done just a little research so far, and there seems to be a pretty big variation on the output of the bulbs, so I'm guessing different techniques will work in part based on how strong and/or how many bulbs you are using. I'm not sure how accurate it is, but the manufacturers use a number to designate its 'microwatts' (according to one manufacturers description I read), like the the Zoo Med Reptisun is "10.0" and the Zilla Desert is "50".
I found some 18" 15w T8 bulbs and an inexpensive fixture for single bulbs. I'm thinking about getting two sets and using the aluminum L channels to make one long light out of them that will fit between the two rows of COBs I have in my main light. I guess from there I'll just have to try different amounts of time and see what works.