Yet the datasheets for those T5's say otherwise. Your stubbornness is preventing you from reaching the next level (HPS). Unlock your potential.
I'm not making any arguments.
T5 bud is just regular bud.
Why should I? I stayed away from this thread for a few weeks and then someone made the claim that they measured the radiant power output of their lamp and used that to calculate efficiency. The equipment for taking that measurement costs more than almost anyone on RIU can justify buying. I don't think he actually took the measurement.
No I could care less about numbers.
No, I'd rather call bullshit out on his measurements. I would love to know how he came up with that measurement. Hopefully an integrating sphere, but probably not since the numbers don't add up.
that number came from sylvania and agreed with numbers from GE. the surface area of a tube is easy to calculate as is the TC of a flat plate radiator and that test agreed with the efficiency numbers based on published data. I think data from sylvania and GE could be considered reliable since these figures are used to design lighting systems for commercial buildings and companies that large probably have well equipped labs.strange how the led crowd blindly accepts claims from led grow light makers who are too small to have well equipped labs but question data from major, well established corporations.look at the chart for a 850 series tube. an F54T5HO tube produces 5000 lumen
REALLY!!!!! the only way you have to defend your position is to insult your opponent.I never claimed that I measured radiant power. I relied on data from major manufacturers.I am not going to trade insults with you. but if HPS is so great then why do they produce so much more heat than T5s?heat is wasted energy. I do not need vents and blowers on my closet to keep temperatures down but I would need those things if I ran a 150 or 250 watt HPS in that closet.I conduct test to learn the truth for myself.I use the information to make decisions about my actions. i'm not trying to sell anything to anybody.i'm use to jocks and stoners criticizing people who are smarter than them and I did drop out of college.How did you come up with 64.2W of radiant power? Did you measure this using an integrating sphere? (it doesn't sound like it)
It sounds to me like you made up the number 64.2W and then used it to calculate an efficiency of 31.6%.
The theory you hate so much says ~25%. Are you sure you used an integrating sphere to measure radiant power?
really....? You too? Did you also drop out of high school, or was your score not high enough to warrant that?
The only 850 series tube I found on the datasheet you showed was for octron, which is T8. It only shows 830, 835, and 841 for pentron.
Their own datasheets are how I calculate radiant efficiency. I'm not questioning their data. I'm questioning you.
you read the wrong chart. look at the chart above the one you read. nowhere in that file do they state radiant or par efficiency. all major bulb manufacturers post radiant energy numbers for their bulbs but none of them post par.you clearly love your lights and love arguing with anyone who post information that challenges your beliefs but arguing with you is a waste of time.T5s work best for many of us and we use what works best for us.my closet is not vented and stays cooler with T5s than with HIDs or LEDs.my $79 T5 fixture grows good product and keeps my medicine bowl filled. if HIDs or LEDs worked better in a small low power closet grow I would use them. a $150 watt HPS fixture only cost $80 but produces way to much heat for an unvented closet grow.name calling only reviles you ignorance
I did not read the wrong chart. The datasheet you just showed me had the 850 SPD on it, and that's what I used along with another datasheet for pentron which said that initial luminous efficacy at 35 degrees C is 91lm/W. They don't show on any of those datasheets what the radiant power output is, but it can be calculated. (A 54W pentron 850 outputs 14.8W of radiant power when brand new and at 35 degrees C)
you do realize that this is a T5 thread?
that chart only shows relative output you need a chat that show uw per lumen to get any meaningful data like this one. the file I linked to has charts at the bottom that show watts per 1000lumens for different wavelength as well as total watts per 1000 lumens. you are clearly to immature to carry on a reasonable conversation with an adult and I am not in the mood for your childish insults.
A relative SPD chart can be used to calculate LER (luminous efficacy of radiation).
Oh, you mean this thread is for low wattage t5s? Why?
