# LED PCB bulb - how much cooling do they need, what is their maximum temperature

I am building a SAD (Seasonal Affective Disorder) light box - its a super bright light.

The specs of the LEDs I am using:

50W Warm White LED IC High Power Outdoor Flood Light Lamp Bulb Beads Chip DIY
Lighting color: warm white
Color temperature: 3000K
Beam angle: 120 degree
Working voltage: DC 32-34V
Working current: 1500mA
Power: 50W
Luminous flux: 3800LM
Size: 52 x 46mm


Although these specs don't specify the maximum temperature they can handle prior to failure, what temperatures can LEDs typically withstand?

As a ball park figure I can tell you an Intel CPU is recommended to stay below 70°C but can handle upto 100°C at most - but I don't know what the thresholds for LEDs are!

I'm using a coolermaster i30 on a 150x150mm copper plate to cool 9 of these LEDs, the i30 is supposed to be able to "cool to 320Watts", which I would assume means it can keep a 320 Watt CPU below 70°C

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Be careful about shielding them from direct vision, you're starting to get to the intensities where LEDs will burn your retinas. They put out semi-coherent light which can be damaging if shined directly into your eyes. You're lucky if the burned trail after-image lasts a day or two. –  Fiasco Labs Jan 24 at 2:28

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