What is the lumens per watt of the SST70 LED?


• Typical efficacy 162 lm/W at 700 mA, (6V)*
• High Brightness Cool white LED with maximum output in excess of 3,200 lm
• Available in 6500K, 70 CRI (typical) color point
• Compact monolithic emitter ideal for directional lighting applications with high
• Rated and targeted at 85 °C
• Maximum drive current: 5250 mA (6V) ,2625 mA (12V)

Looking at the SST70 LED performance table,
• Typical efficiency of 162lm/W (6V) at 700mA
There is something like this. 700mA and 6V here
What does it mean?
In the case of CREE, it is easy to simply find lumens per watt from a performance table.
For XHP70, if you do 3022 lumens divided by 32W, you can see that the efficiency per 1W is 125 lumens. A typical 15W 18650 battery gives 1875 lumens.
However, in the case of the Luminous SST70, it is difficult to calculate the efficiency per watt because there is a condition of 700mA 6V. I don’t know how many lumens come out when using one 15W 18650 battery.
Are there any gentlemen who know the correct answer?

Regards Xandre

Hello. friend. I’ve seen that post.
Unfortunately, the information seems to be about the old SST70.
And I couldn’t find an answer because I don’t know what “700mA and 6V” means. Thanks.

You can only really ballpark the efficiency. Depends on the brightness bin, the chip’s temperature, etc.

And the temperature depends not only on the current, but how well it’s heatsinked, etc.

That’s why some people have lights with crappily mounted LEDs (shelf not flat or has a bump in the middle, not enough thermal goop, too much thermal goop, etc.), and the LED just quietly melts.

They are testing the emitter, feeding it 6 volts and feeding 700 milliamps or .7 of an amp. The rest of it’s just math and ohms law. Which I believe6 volts at .7 of an amp is 4.2watts. 162 lumens per watt they say. So 162 lumens times 4.2 watts would give you about 680 lumens at .7 of an amp.

So if you have a 15 watt battery you say(a decent 10amp 18650 will be way more than 15 watts, more like 40+). 15 watts times 162 lumens is 2430 lumens. In perfect conditions mind you. But you have the driver that will decide how much of that 15 watt battery makes it to the emitter. Unless you are direct driving it.


That test was not very long ago and I am not aware of a newer version of the SST70?

Thank you friend. It gave me the best answer for my lack of knowledge about voltage. I will refer to this when posting led in Korea.