raggie33
*the raggedier*
- Joined
- Aug 11, 2003
- Messages
- 13,854
is there a limit or are they like cpus. will some day we get a 1000 lumens per watt
Take the XHP35 HI. If someone had told me 10 years ago there would be an LED that ran efficiently and cooler than a halogen bulb that cranked 1300 lumens I would have thought they were drunk.
Well there is a limt and this idial source is a green light (555nm) and it is 683.002lm/w
I don't know if it will ever be posspole in led or any other kind of light bulb
But it is the limit of luminous efficiency
You can't make it more to the point and relevant than this answer, wich also implies that white leds will always be less efficient than this theoretical monochromatic source.
Does it?
There are absolutely limits. It's a function of the color temperature and the CRI you want. ~350lm/W is probably the practical limit for anything that doesn't have a low CRI.is there a limit or are they like cpus. will some day we get a 1000 lumens per watt
That's a totally different discussion from luminous efficiency. As LEDs become more efficient they can become much brighter because there is far less heat to deal with.10 years ago we use to be impressed with 100 lumens, and wondered if LEDs would ever reach 500 lumens.
I thought the limit today is how to reduce heat as an unwanted result of increased brightness.As LEDs become more efficient they can become much brighter because there is far less heat to deal with.
The law will probably be the limit of LEDs.
Some day someone will feel the are too bright.
Heat is a problem. A 30lm/W LED putting out 100lm generates about 3W of heat. A 150lm/W LED putting out 650lm generates about 3W of heat. You get a lot more lumens for the same amount of heat. As luminous efficiency continues to increase you can continue to get more or more lumens without overheating the die. However, luminous efficiency can only continue to advance so far. We're pretty close to peak luminous efficiency.I thought the limit today is how to reduce heat as an unwanted result of increased brightness.
EDIT: I might have misread your intent of your post; is the increased brightness a result of dealing with excess heat?
Well there is a limt and this idial source is a green light (555nm) and it is 683.002lm/w
I don't know if it will ever be posspole in led or any other kind of light bulb
But it is the limit of luminous efficiency