lumens to watts calculator ledhow many lumens is 15w ledled tube lm/w efficacy
Lumens ↔ Watts Calculator
Convert between lumens and watts for LED tubes. Find the right wattage for your required lumen output, or calculate the lumen output of any LED tube.
2100 lm
Required Lumens
140 lm/W
LED Efficacy
15.0W
Watts Needed
T8 & T5 LED Tube Lumen Output Reference
| Model | Wattage | Lumens (Std) | Lumens (DLC Prem) | Efficacy | Replaces |
|---|---|---|---|---|---|
| T8 2ft 9W | 9W | 1,100 lm | 1,260 lm | 122–140 lm/W | F17T8 (17W) |
| T8 3ft 12W | 12W | 1,500 lm | 1,680 lm | 125–140 lm/W | F25T8 (25W) |
| T8 4ft 15W | 15W | 2,100 lm | 2,250 lm | 140–150 lm/W | F32T8 (32W) |
| T8 4ft 18W | 18W | 2,340 lm | 2,880 lm | 130–160 lm/W | F40T8 (40W) |
| T8 8ft 28W | 28W | 4,000 lm | 4,480 lm | 143–160 lm/W | F59T8 (59W) |
| T5 3ft 10W | 10W | 1,350 lm | 1,500 lm | 135–150 lm/W | F21T5 (21W) |
| T5 4ft 14W | 14W | 1,800 lm | 2,100 lm | 129–150 lm/W | F28T5 (28W) |
| T5 HO 4ft 22W | 22W | 3,200 lm | 3,520 lm | 145–160 lm/W | F54T5HO (54W) |
Frequently Asked Questions
How many lumens is a 15W LED tube?
A 15W T8 LED tube produces 2,000–2,250 lumens. Standard grade: 2,100 lm (140 lm/W). DLC Premium grade: 2,250 lm (150 lm/W). This compares to 2,800 lm for the F32T8 fluorescent it replaces, but LED delivers more usable light due to directional output (no light trapped in the fixture).
How many lumens is an 18W LED tube?
An 18W T8 LED tube produces 2,340–2,880 lumens. Standard: 2,340 lm (130 lm/W). DLC Premium: 2,520–2,880 lm (140–160 lm/W). This replaces a 40W T8 fluorescent (3,200 lm) while using 55% less energy.
What lm/W efficacy should I specify for DLC rebates?
DLC Standard requires ≥100 lm/W; DLC Premium requires ≥140 lm/W. Specify DLC Premium (≥140 lm/W) for maximum rebate eligibility and ASHRAE 90.1 compliance. Most utility rebate programs offer higher rebates for DLC Premium vs Standard products.
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