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I dont understand the wattage of these IR leds. Please help !

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AlcidePiR2:
I am looking for high power 940nm IR leds

These ones should be OK
https://www.aliexpress.com/item/High-Power-LED-Chip-Infrared-850nm-IR-LED-1W-3W-5W-10W-20W-30W-50W-100W/32631733161.html?spm=2114.search0104.3.1.1b93f00dnR6XhD&ws_ab_test=searchweb0_0,searchweb201602_3_10065_10068_319_10892_317_10696_453_10084_454_10083_433_10618_431_10304_10307_10820_10821_537_10302_536_5736111_5736011_10843_10059_10884_10887_100031_321_322_10103-10892,searchweb201603_53,ppcSwitch_0&algo_expid=560ced6f-919e-4910-a845-f853519b784e-0&algo_pvid=560ced6f-919e-4910-a845-f853519b784e

But I dont understand their  counts for wattage. In their table
for example, for 20 w  you  have  forward voltage : 12-14V   and Forward current : 600mA

If I count, it makes at max  8.4 W  and not 20W.  It is the same for all the other  940nm leds, and this is actually what seems to be roughly what is written on the bags ( 10w : 5-6V, 900mA).

HOW CAN IT BE ?  Which  led driver should I use then ?

Thanks for any help

Benta:
Impressive! Aliexpress offers over-unity energy.
There's a reason why I've never bought something from there.

glarsson:
About the standard difference between standard W and Chinese W when used for LEDs.

Benta:

--- Quote from: glarsson on January 20, 2019, 09:37:07 pm ---About the standard difference between standard W and Chinese W when used for LEDs.

--- End quote ---

Hahaha!

Seriously though, perhaps they mean W/sr? But without a radiation pattern, this is useless as well.

james_s:
My experience with specs on this sort of random Chinese stuff is they just make something up, you really can't rely on any of the data.

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