Originally Posted by jeffaquarius
Just over simplifying things. You don't need a calculus to understand the basics. If you have 55 emitters with 3-watt emitter each doesn't it supposed to be a total of 165 watts?
Actually you do need fancy math, but that's why I had to attend 4 years of schooling
The fact they are 3W LED
doesn't mean anything, they could be 100W but if the driver is only 120W then that's all the output you are getting across the entire load.. They run LED
's at a lower wattage because they last longer. LED
's are an electronic component and like most things in the world of electronics, the more you run them at full rated output the faster they break.
We use the same method of thinking in the field when installing things, if the rated diode is suppose to be 100A and 100V then you install one rated for 150A and 150V. Just makes sense to oversize them a little bit and make them longer lasting to the customer with really no cost increase.
As for heat sinks and fans I really don't understand this myself, when I install strip LED
's (5W LED
's in lengths of min 5ft) we don't use anything like this, and after 24hrs of constant running you can still walk up and touch them with your bare hand. They heat they produce is very very little and really is a 3$ computer fan in the top of the fixture worth as much as they want us to believe?