Hello highlight.js! The energy of led is 1/10 of the Traditional halogen lamp, it can better protect the electron circuit and save Oil. A localized version is available for you. This is a better technology than the first generation DIP LEDs. If you choose Blue, white or green, you may not need a resistor. If you choose Red or Yellow with a 3.3V drive signal on a 2V LED, you need a Resistor. LED light fittings It is recommended that a wrist band or an anti-electrostatic glove be used when handling the LEDs.All devices, equipment and machinery must be properly grounded.Damaged LEDs will show some unusual characteristics such as the forward voltage becomes lower, or the LEDs do not light at the low current.                                     , 1. What is a "fee area" exactly and why is it named that way? Resistor = 5 - 4.8. 1. The energy of led is 1/10 of the Traditional halogen lamp, it can better protect the electron circuit and save Oil. Does Improved Abjuration affect spells that have a circumstantial ability check? The SMD type LEDs are mounted on an aluminum substrate and enveloped in an epoxy resin. You must examine the choice of both uC driver and LED to ensure this meets your power budget tolerance. You are really just risking the microcontroller and the led, a few bucks at worst. SMD (Surface Mount Device) parts are tiny versions of their standard counterparts. 5 = 4.8 + Resistor. There is a couple out there rated 3.3v but I understand it is not safe to connect it without resistor even though it is 3.3v rated. To save space I'd like to have LED that takes 3.3v without resistor. Update the question so it's on-topic for Electrical Engineering Stack Exchange. ©2019-2020 Signify Holding. Before opening the package ,The LEDs should be kept at 30°C or less and 70%RH or less. LEDs will be dimmer at lower currents, but may still be bright enough for your use at 5 mA or less (I have some green LEDs that I had to run at somewhat under 1 mA to get them dim enough!). But using a resistor is the easy & safe way to design the circuit. Also provide more background on what you intend to do. Dimming with LEDs. "Mollification" of a convex function with a finite set of points unchanged. A few manufacturers have created an SMD LED lighting solution by combining it with a resistor, small circuit board, lens and cable to provide and bright, cool LED light that runs on just 12 volts, and which is tiny enough to be mounted almost anywhere, (for instance, to light a cup holder). There are some LEDs that include a current-limiting device, so don't need an external resistor.