John Daviot
John's latest writings
Latest in Domestic LED Lighting
Continuing developments of LED's make this form of lighting an option for a wide range of uses. A light emitting diode can transform electrical energy into light very efficiently. The latest designs can produce 80 to 90 lumens of light from a watt of electricity. That does not mean much until you compare it to a fluorescent lamp, which can also produce about 80 lumens per watt. The prospects are for LED are to improve... (posted by John 3 years 210 days ago.)
Continuing developments of LED's make this form of lighting an option for a wide range of uses. A light emitting diode can transform electrical energy into light very efficiently. The latest designs can produce 80 to 90 lumens of light from a watt of electricity. That does not mean much until you compare it to a fluorescent lamp, which can also produce about 80 lumens per watt. The prospects are for LED are to improve... (posted by John 3 years 210 days ago.)
Problems With Cheap Light Fittings
Everyone wants a good deal but the reluctance of other people to work for nothing makes them hard to come by. Light fittings are no different to anything else; the cost usually reflects the quality. Not every job needs the top of the range fitting so here are some thoughts on what you are paying for. One of the worst enemies of light fittings is heat. This is why it is a bad idea to put in a stronger bulb than the... (posted by John 3 years 239 days ago.)
Everyone wants a good deal but the reluctance of other people to work for nothing makes them hard to come by. Light fittings are no different to anything else; the cost usually reflects the quality. Not every job needs the top of the range fitting so here are some thoughts on what you are paying for. One of the worst enemies of light fittings is heat. This is why it is a bad idea to put in a stronger bulb than the... (posted by John 3 years 239 days ago.)
Different Types of Light Bulb
Electrical Terms. The important electrical operating characteristics of a light are voltage and wattage. Light fittings are also labeled with a maximum wattage rating that should not be exceeded. This is because General Lighting Service (GLS) lamps convert only 10% of the electricity they use into light and convert the remaining 90% into heat. The maximum wattage rating of light fitting is to prevent damage by... (posted by John 3 years 246 days ago.)
Electrical Terms. The important electrical operating characteristics of a light are voltage and wattage. Light fittings are also labeled with a maximum wattage rating that should not be exceeded. This is because General Lighting Service (GLS) lamps convert only 10% of the electricity they use into light and convert the remaining 90% into heat. The maximum wattage rating of light fitting is to prevent damage by... (posted by John 3 years 246 days ago.)
How To Estimate Sufficient Lighting
In the good old days everyone in the English speaking world used candlepower and foot-candles to measure the intensity of a light source and the amount of illumination at an object. Now to make the maths easier the rest of us use the metric system which has these units. Lumen are used to measure the amount of light being given out by a bulb. For example a 100 watt incandescent bulb gives off approximately 1300... (posted by John 3 years 260 days ago.)
In the good old days everyone in the English speaking world used candlepower and foot-candles to measure the intensity of a light source and the amount of illumination at an object. Now to make the maths easier the rest of us use the metric system which has these units. Lumen are used to measure the amount of light being given out by a bulb. For example a 100 watt incandescent bulb gives off approximately 1300... (posted by John 3 years 260 days ago.)
Tips on Positioning Lights in the Home
Where to place the lights in a new home or renovation is often a worry as once the wiring is in pace it is expensive to make changes. The following guidelines are based on practical rules of thumb and may be helpful in planning how to place your lights. For general lighting in the home downlights with the equivalent of a 100watt incandescent are a good choice. New downlights have been designed for compact... (posted by John 3 years 260 days ago.)
Where to place the lights in a new home or renovation is often a worry as once the wiring is in pace it is expensive to make changes. The following guidelines are based on practical rules of thumb and may be helpful in planning how to place your lights. For general lighting in the home downlights with the equivalent of a 100watt incandescent are a good choice. New downlights have been designed for compact... (posted by John 3 years 260 days ago.)
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