LED board
24 × 2835 0.5 W cool white 6500 k on an aluminium board, all in parallel, each with a 4.7 Ω ballast resistor · each LED 150 mA rated, 200 mA max · about 1440 lm at rated current · runs from about 3.1 V: a 3.2 V LiFePO4 cell, or a constant-current driver
Try it on the benchThe lab drops it on an empty bench and opens its datasheet card.
Typical part: Aluminium LED board (MCPCB) with SMD LEDs in parallel
Pins
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Ratings and limits
| LEDs | 24 × 2835 0.5 W |
|---|---|
| Per LED | 150 mA rated, 200 mA max |
| Board at rated current | 3.6 A, about 1440 lm |
| Ballast | 4.7 Ω per LED |
How to use it
The light engine of cheap floodlights and solar lights: 3 V-class LEDs in parallel, run straight from a 3.2 V LiFePO4 cell through small resistors. Without ballast resistors the LED with the lowest Vf takes more than its share.