5mm LEDs and a real good light?

I recently came across an article which mentioned that 5mm LEDs are not suitable for general lighting. I do not agree with this view.

A 5mm LED will produce much less heat and hence the heat can be managed with a proper PCB design and without using any heatsink.
A correctly driven 5mm White LED will live its rated life, which in case of a good manufacturer is easily in the 30,000 to 50,000 bracket.
The ageing of phosphor and gradual change in colour spectrum is an issue faced by all white LEDs and not only 5mm LEDs.

For a neutral assessment check this US Government website:
http://light.lbl.gov/technology-assessment.html

I have designed and made a board with 18 numbers of 5mm (hat shaped for larger angle) white LEDs. This board is ideally suited for low light applications like stairways, corridors, and in some rural lighting applications. With LEDs from Yetda I have got very consistent light and colour. In my test I could get 47 Lux at 1 metre from the PCB. and about 170 Lux at 0.5 Metres.

Annunciator

Design & Development of Annunciator . For a California based Company redesigned their annunciators around modern technology. The annunciators could handle 1 to 128 input modules with inputs to display from 8 to 1024 zones. The original full analog design was simplified with a single main PCB with a powerful microcontroller and multiple smaller PCBs with smaller microcontrollers, Analog & Digital inputs and outputs. PC based Software was developed to configure the system for multiple parameters. The duration of the project was 8 months.Test jigs were replicated at both places (USA & Goa, India).

USB Meter - For Measuring Capacity of a USB Power Bank & Other 5V Devices

You have bought a power bank and are wondering if it really measures up to the advertised Capacity? Check with this Power Meter. You can connect it to any USB Power Source like your Power Bank. It will Show you the Output Voltage of the Power Bank - This should be 5V On the USB Female side you connect your Load. You can then see the Current that the Device Consumes. Leave it on for a while and it can give you an indication of the Power Consumed. This is also the Power delivered by the source (Could be your Power Bank) It measures Voltage & Current - Power = Voltage x Current (For DC Voltages like this one) The Total Energy that can be delivered by your Power Bank = The Capacity of your Power Bank. Energy (Or Capacity) is the ability for the Power Bank to give X Watts for T Time before it runs out of juice. Hence TIME is the factor that comes into play to measure the Total Energy that can be delivered by your Power Bank or The Capacity of your Power Bank Capa...

Electronics for an Electric Boat

Built around a Lynch Motor, the boat system is designed to provide speed and direction control. The motor is regenerative and regenerative braking is used. All parameters including rpm, temperature and torque are measured and logged for analysis. A USB interface is provided to connect to a PC. The PC Software can be used to configure limits for rpm, temperature and battery voltages.

Electronics Engineering

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