How Many Lumens is this new 40W LED Camera Flash

jd_oc · Feb 2, 2012

They are claiming 40W in short duration bursts (flash) and only $2. Just wondering if this would make an awesome 'nuke mode' flashlight.

http://www.st.com/internet/com/press_release/p3268.jsp

CKOD · Feb 2, 2012

A)Thats a driver chip. No LED, no supporting passives, no PCB, no microcontroller to talk to the I2C interface, just the chip for the driver.

B)The 40W is just for the flash, not for the "torch" mode, so just for a fraction of a second while the camera is capturing. The driver is limited at 1.2A according to the data brief, not even close to "nuke mode" for any of the common power LEDs used around here.

C) $2, if you buy 1000. Need 1000 driver chips? Probably $5-6 each on digikey once they are released if digikey stocks them.

Viper715 · Feb 2, 2012

To answer the title of your question watts is voltage multiplied by volts. My big bruiser is a 4.2 volt flashlight at peak pushes 8-9 amps so peak wattage is 37.8 Watts and peak lumens is around 3000 lumens.

jd_oc · Feb 2, 2012

Thanks guys. Completely missed the fact that it's only a controller, no actual LEDs (I saw the picture and thought those little dots were small LEDs). I guess that makes sense as to why it is so cheap. I wonder what LED cell phone makers will end up pairing it with. If the driver is limited to 1.2A then that means it would be pushing 33 volts to make 40W.

How Many Lumens is this new 40W LED Camera Flash

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