I am designing a LED setup with 3 leds and a 9V battery. Nothing more I got the following specs from the seller. How much resistance do I need if I want them to shine as bright as possible without blowing up?
5mm 940nm IR Infrared Emitter LED Diameter: 5mm Wavelength: 940nm
Maximum Power: 70MW
Maximum Forward Current: 30MA
Maximum Forward Voltage: 5V
Maximum Pulse Current Peak: 75MA
Welding Temperature / Time: 240/ ≤ 5S°C / S