QUOTE(jchong @ Jul 18 2013, 08:31 PM)
Good to see you started this thread zealless.
Back to your original question, for me the priority is reliability. The whole light (driver + chip) should be able to last years without problem. Often people promote LED saying it has long lifespan like 50k or 100k hours, but in reality most don't last anywhere as long. Don't know if it is driver issue or chip issue.
Related to reliability is warranty. If something is tested to be reliable I think the manufacturer would give longer warranty.
After that I will look at efficiency - lumens/watt.
Then CRI. I think 70-80 is enough for general use. I don't plan for 90+ CRI unless got some specialized application.
Hahaha you are correct brother, thats why they say *"up to" 50000 hours, yes, they won't last that long , because once u reach about 35,000k, you lumen degrade is pretty high, you might want to replace to newer tech, high lumen per watt, better driver, i will say good for 4 - 5 years, although technically it could last up to 8 - 10 years
reliability, well, product have no problem on design, the way consumer use it that worries the manufacturer. thats why there are limited warranty.
you see many installer want to be quick and cheap, so they always loop in series, that is not the problem, problem is the wire size they use is the same.
i assume a lot of people understand voltage drop, the longer the wire go, the more the voltage drop, thus a bigger wire is need.
just same as pipe, if u use a small pipe, the outlet near the source, will have very good floor, but the further (horizontally) the flow will drop pretty bad
same for voltage, you need a bigger pipe. well insufficient voltage always the case that cause the LED to flicker and damage the driver. especially dimming
you see we can make the driver very reliable, like handphone factory charger, but i will cost you RM150 a driver, and no one will pay for it.
like a lot of previous sifu have commented, good not cheap, cheap always some flaws, so is like gamble
even the product i sell is not perfect, unless i am selling a 15w downlight about rm400, 150 for driver, 150 for casing and LED, then maybe i am very confident on the quality.
they are quality commercial grade LED that can last 65,000 hours, minimal degration, hi CRI , warranty 5 years ...
but normal consumer won't pay for that, not even big corporates.
thanks for your feedback, i just realise a lot of people don't really need high CRI and i think reliability is the next one
would you consider like lets say, only 25,000 hours , high efficiency 80 -100 lm/w, CRI 70+ , warranty 2 years with good driver
because this will really drop the LED price to top ten price