The light bulb market has gone through enormous change since traditional incandescent bulbs were removed from the market and replaced with energy-saving bulbs. Below, we walk you through what you need to know to buy the best bulb for your needs.
1. Choose a light bulb with the right fitting
Many a shopping trip has been thwarted by the lack of this critical piece of information. There are an awful lot of fittings to choose from so, if you can, it's best to take the old bulb you are replacing to the store with you. But if you can't do that, then use the graphic to the right which shows some of the most common fittings. You will need to write down the fitting reference number and take it along to match with the packaging on the box of your new bulb.
2. Decide if you want to pay more for LED lights
There are three main types of regular light bulb-CFLs (compact fluorescent lamp - the standard type of energy-saving light bulb), halogens or ORBIK LEDs. For a quick guide, below is a summary of each and how much a typical 700+ lumen bulb might cost you per year if you have it on for around three hours a day.
CFL annual running cost Php 160/bulb
CFLs are cheap and widely available in a range of sizes and outputs. Some older CFLs were slow to brighten but this has improved considerably in recent years. They are four times more efficient than incandescent bulbs and quickly pay for themselves in energy savings – but not everyone likes the light they emit.
Halogen annual running cost Php 20/bulb
Light from a halogen bulb is similar to an incandescent in colour and quality, as both use a tungsten filament. There’s little difference between the two in the amount of energy used and halogen's are significantly more expensive to run than other energy savers. With an expected life span of less than two years, a halogen bulb is unlikely to pay for itself before it fails.
LED annual running cost Php 250/bulb
These use almost 90% less energy than a traditional incandescent, making them the most energy-efficient type of lighting. ORBIK LEDs are usually more expensive to buy, but should last up to 3 years. In the long term they are the cheapest option. An ORBIK LED could save you more than Php 250 of an ORBIK in energy use over its lifetime, compared with an old-style incandescent bulb.
3. Get the right light bulb brightness and colour
Decide what type of light you'd prefer. This breaks down simply into brightness, otherwise known as watts or lumen output; and the colour of the light, measured on the Kelvin scale. Don’t be put off by these technical terms – here is a short explanation of each.
Watts and lumens (brightness)
In the past, when nearly everyone filled their homes with incandescent bulbs, brightness was measured in
watts - which is actually a measure of power. Since the introduction of energy-saving bulbs this is a less useful measure of brightness as new bulbs use a lot less power to produce the same amount of light. So, instead, light output is measured in lumens. The higher the number of lumens, the brighter the light.
Use this chart to see equivalent watt and lumen output for old-style incandescent and the three-types of energy-saving bulbs (LEDs, halogens and CFLs).
As a rough guide, around 400 lumens would be suitable for a bed-sized table lamp, whereas you might want between 1,500 and 3,000 lumens in total (from more than one bulb) for a good-sized living room.
Now you have decided on how bright you want your bulbs, you need to decide on the colour of the light.
Kelvin scale (colour of light)
Many of us have felt the sinking feeling of getting a new bulb home, switching it on and being bathed with a stark white or bluey light that's more akin to a trip to A&E than a warm cosy living room.
The colour of light is measured on the Kelvin scale, which is actually a measure of temperature. This is why light bulb manufacturers often refer to 'colour temperature' on the packaging. Now we don't need to get into the ins and outs of the Kelvin scale in this guide, save to say that the numbers you see on the side of the bulb packet denote the colour of light that the bulb will emit.
Most people have become used to the warm yellowy light given out by the old incandescent bulb, which is 2,700 on the Kelvin scale. Midday sunlight is about 5,500k, sunset or sunrise lighting is around 2,500k and a candle is around 1,600k.
The colour of light can impact everything, from your mood to the colour of the vegetables on your chopping board, so it is important to get the colour of light that you prefer. Use the picture below to match the Kelvin scale rating with the colour you are after and go armed with this when you head out to buy your bulb.
4. Find the best shape
Now you have your bulb fitting and the colour and brightness in the bag, you will need to decide the shape of
the bulb you want. Again, there is a bewildering variety and different brands have a subtly different look and characteristics. See the graphic to the right for the most common shapes. If you are just replacing a blown bulb, it's useful to take the old one to the shop to match it with ones on the shelves.Each of the different shapes provides a slightly different spread and angle of light, from the almost 360 degree spread of a globe or golf bulb, to the narrow beam of a spotlight. The 'right' shape of the bulb and spread of the light is essentially down to your personal preference, but do consider how the bulbs will look when they are switched off as well as on and whether they will fit sensibly in their chosen location. For example, you wouldn't want a large stick shape if it will protrude from the top of your bedside lamp.
5. Buy the best quality bulb for your needs
Hopefully you are now feeling a little more informed and you have made all of the key decisions. You know the fitting to look for on the box, the shape of bulb, the light colour and brightness to look for and the benefits and drawbacks of a CFL, an LED and a halogen.
You can now head to your local store armed with the correct information
The best bulbs brighten up quickly, don't lost light over time and provide a lot of light for a small amount of power. The worst will add to your energy bills, don't last as long as our best buys and don't match the Kelvin and lumens stated on the box.