Why can LED not yet rival halogen? - LED Luminaries

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Why can LED not yet rival halogen? - LED Luminaries: "f a he"

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Journey towards Making the Most Efficient Garden / Pathway Light

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When I first started with Solar Lighting it was to create a simple robust street light.
Created a Light that was good and robust. It was a typical Solar Street Light.
The LEDs were superflux capable of being driven to 50mA - The cooling was provided by the four leads and the PCB was made with lots of copper area to dissipate the little heat.
The design as based around a PIC micro-controller and the output was switching via the controller.
This was in 2005.

Since then I have tried various designs in lighting streets, gardens, porches and pathways.









I am on track to now make one of the most efficient lighting for Gardens, Walkways, pathways and porch lighting.
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Solar Thermal

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At home we need Hot water for bathing and washing.
Industries require hot water for various processes including space heating and climate control.

Solar Hot water systems are the best choice for domestic as well as industrial use.  They are more efficient when compared with Solar PV in converting the suns energy into useable energy.

A typical Domestic hot water system consists of a Solar Thermal Panel (1, 2, 3 or even 4 panels are used for a single system).  The other important component is the Solar Tank.  This is where hot water is stored.  It is thermally insulated and is the equivalent of a Battery in a PV system.

Although there are two basic types of Panels - Evacuated tube type & Flat Plate type - the Flat Plate Collector is more commonly used.

Each Panel is approximately 2 square Metres.
It generates the equivalent of 5 KWh of electricity on a typical Sunny day in most parts of India.  (The generation will vary by geography & season).
If we compare this with a 2 square metres …
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What do I want in my Android Phone?

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Big Screen, more RAM, Stock Android or Good Camera - What are my priorities. So here goes a list of items that one should check out and the reasons for doing the same


Screen
4.5 inch is about the minimum required today for a decent experience with Social media, emails and light reading. (A 4 inch one is a heavy compromise)
5 Inch is the minimum for people who do a lot of reading online - This is also the ideal size for a compromise between handling ability and readability.
5.5 Inch is the ideal size for reading (most kindle models are 6 inch). But this is a little big for single handed reading.

RAM
With the kind of apps being released and the frequent updates, 1 MB is minimum

Android
Some important apps do not work with anything below 4.2 And a few require 4.4 (kitkat) - So I would suggest kitkat at the minimum.
Stock Android is your best bet - Since this is more of a dream, the version that has the minimum bloatware should be ok.
Update: Marshmallow (6.0) is out and it is really goo…
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