Parameters for Choosing LED Bulbs
There are different factors to consider when choosing a suitable LED replacement bulb
Basic Technical Parameters:
- Lumen (Lighting Intensity)
- Watt (Power Consumption)
- Correlated Color Temperature (Light color)
- Color Rendering Index (CRI)
- Beam angle (Spread of light)
- Efficiency (Lumen / Watt)
- Power Factor
- Instant Light
- Dimming capacity
- LED Driver
- LED Chip
Some of the BEST SELLING LED BULBS
1) Lumens (Brightness):
- When we deal with brightness of LED bulb, we must know Lumens not Watts.
- The amount of light emitted from a light bulb is measured in Lumens.
- When we replace an incandescent or CFL bulb with an LED bulb we should confirm that the LED bulb produces the same number of Lumens that the old bulb did.
- As a general benchmark, a standard 60-watt incandescent bulb, for example, produces about 800 Lumens of light. By comparison, a CFL bulb produces that same 800 Lumens uses less than 15 watts
- Do not use watts, as a measure of brightness.
- Lumens represents the amount of light emitted by a light source, and are a more accurate measure of the brightness of a bulb.
- More Lumens means brighter light, fewer Lumens mean dimmer light
- 1 Foot Candle:1 foot candle of light is the amount of light (Lumen) that generates one foot radius away from Lighting source so 1 Foot Candle= 1 Lumen / Sq.Foot
- 1 Lux:1 Lux of light is the amount of light (Lumen) that generates one Meter radius away from Lighting source so 1 Lux= 1 Lumen / Sq.Meter
- It is meaningless if we compare Lumens between an LED bulb and a CFL to an incandescent bulb. While we are measuring Lumens, we also have to consider useful Lumens.
- LED gives directional light unlike incandescent, halogen or compact fluorescent bulbs that give out omnidirectional light (or light all around the bulb). If a light bulb emits light in every direction similarly over and beneath, then light that’s going up can get trapped in the light fitting and totally wasted.
- 50% of light emitted from a CFL or incandescent bulb is trapped inside the fitting and never makes it out and reached for objects. This trapped light is just getting absorbed and wasted as heat.
- The amount of Lumens that actually reached at the objects of Room that bulb produces are called as the useful Lumens.
|Lumens Chart for Incandescent, CFL,LED
- There is no rule for how many Lumen is required.It will depend on room size and shape, height of ceilings, colour scheme, type of lamps & fitting.
||300 to 400
||700 to 800
||400 to 500
||300 to 400
||700 to 800
||500 to 600
||700 to 800
(2) Watt (Power Consumption):
- The amount of energy a light bulb consumed is indicated by Watt.
- The watts refer to how much energy a bulb will use.
- The lower the watts, the lower the electric bill. CFLs and LEDs have a lower wattage than incandescent bulbs, but emit the same light output
- Watts measure power consumption, whereas Lumens measure light actual brightness..
- Wattage is no longer a reliable way to gauge a light bulb’s brightness.
- In the old days, when there was only one basic type of incandescent light bulb was available.consumers could buy the incandescent bulb on the term “watts” .
- Incandescent lamps use the filament material heated to the same temperature, the only way to increase their light output is to increase the wattage. We actually feel the difference in brightness between 60 Watt, 100Watt or 150 Watt light bulbs incandescent bulb.
- When new technology introduces The energy-saving CFL bulbs of 15 Watt CFL bulb produced the same light of a 60 Watt incandescent. A 25 Watt CFL was comparable to a 100 Watt incandescent in light output.
- Generally LEDs produce the same amount of light as an incandescent bulb that has five to six times the wattage.
- LED sources are much more efficient at converting watts to Lumens. Different materials can be used within the LED sources with different light extraction efficacy so two different LED sources can consume the same number of watts but having different Lumens output.
||230 to 270
||250 to 410
||440 to 460
||330 to 450
||800 to 850
||1000 to 1100
||1500 to 1600
||8 – 12
||4 – 5
||13 – 18
||6 – 8
||750 – 900
|75 – 100
||18 – 22
||9 – 13
||1100 – 1300
||23 – 30
||16 – 20
||1600 – 1800
||30 – 55
||25 – 28
||2600 – 2800