Thx.
Thx
What we can see here is that 190lum/w is reliable although only in slightly unusable spectrums (5000k 70cri). I thought important to get this info as some had cree as slightly overstating their performance in datsheets, but it appears as it is correct here.
To be honest I haven't done a comparison to the data sheet, from times I have done in the past crees data sheets seem to be alot more conservative than other companies.
I really want to compare a cree 5050 to a lumileds 5050 as I know the raw chips come from the exact same factory but lumileds claims much higher efficiency.
Trusting data sheets has really fucked me up in the past and now days I only trust my own results and that is only after I have checked that I have done everything perfectly as I have also made mistakes when measuring in the past. Some of the data sheets I read do not add up to me. I know the raw chips that most companies use but yet I see claims that are far beyond what they should be. I have my own chips made in China but I do not even trust the results that the company manufacturers for me say, I wait until I check it myself. There it really something wrong with sphere tests though, I do not believe that they can be done correctly when measuring single chips as I have never been able to achieve the same results as a sphere test when I test a single chip. When I test multiple chips it makes a difference and actually matches a sphere test alot of the time when they also test multiple chips.
I need to do more tests and I will share them with you all as I go so you will see what I mean by all this.
