LED Bulb vs Tubelight Electricity Consumption (Cost Comparison)
For decades, the standard 4-foot fluorescent tubelight was a staple in every Indian living room. Today, the LED bulb has taken over. But if you still have old tubelights running in your house, you might be wondering exactly how much extra money they are costing you every month.
Let's compare the wattage, brightness (lumens), and monthly electricity bills of LED bulbs, LED tubelights, and old fluorescent tubelights.
Quick Answer
An old fluorescent tubelight consumes 45 to 55 Watts (costing about ₹120 per month). A modern LED bulb providing similar brightness consumes just 12 Watts (costing about ₹28 per month). Replacing an old tubelight with an LED alternative pays for itself in electricity savings in just 4 months.
Power Consumption Breakdown
To calculate the electricity bill, we must know the exact wattage. Let's look at the three most common indoor lighting options in India.
| Lighting Type | Average Wattage | Units Consumed (10 hrs/day for 30 days) |
|---|---|---|
| Old Fluorescent Tubelight (with Choke) | 40W Tube + 10W Choke = 50W | 15 Units |
| LED Tubelight (Batten) | 20W | 6 Units |
| Standard LED Bulb | 9W | 2.7 Units |
The Hidden Cost of the "Choke"
A major reason old fluorescent tubelights are terribly inefficient is the heavy, rectangular box attached to the fixture called the "magnetic choke" (or ballast). While the glass tube itself is rated for 36W or 40W, the choke draws an additional 10 to 15 Watts just to create the high voltage needed to spark the gas inside.
This means your 40W tubelight is actually drawing over 50W from your meter. Furthermore, this magnetic choke hums and generates heat, which is purely wasted electricity.
Monthly Bill Savings (The ROI)
Let's assume you have 4 old tubelights in your house, running for 8 hours a day. The electricity rate is ₹8 per unit.
- Current Cost: 4 tubes × 50W × 8 hours = 1.6 Units per day. Monthly = 48 Units (₹384 per month).
- If replaced with 20W LED Tubelights: 4 tubes × 20W × 8 hours = 0.64 Units per day. Monthly = 19.2 Units (₹153 per month).
You save ₹231 every single month. Since a good quality 20W LED batten costs about ₹250, your investment pays for itself in less than 5 months!
Frequently Asked Questions
Does a tubelight consume more electricity than an LED bulb?
Yes. A traditional fluorescent tubelight with a magnetic choke consumes around 45 to 55 Watts. A modern LED bulb that produces the exact same amount of light consumes only 9 to 12 Watts.
Is an LED tubelight better than an LED bulb?
An LED tubelight (usually 18W or 20W) provides a wider spread of light across a room compared to a single 9W LED bulb, making it better for living rooms. It consumes half the power of an old fluorescent tubelight.
How many units does a 9W LED bulb consume?
If you run a 9W LED bulb for 10 hours a day, it consumes just 0.09 units daily. Over a full month (30 days), it consumes less than 3 units (approx ₹24).
Why does an old tubelight flicker and consume more power?
Old tubelights use a magnetic choke (ballast) and a starter. The choke itself wastes 10 to 15 watts of power simply generating heat and magnetic fields, which adds to your electricity bill.
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