Light Bulb Comparison
| Type |
Wattage |
Lifespan |
Cost |
| Incandescent |
60W |
1,000 hrs |
$1 |
| Halogen |
43W |
2,000 hrs |
$2 |
| CFL |
13W |
8,000 hrs |
$2 |
| LED |
9W |
25,000 hrs |
$2-5 |
LED Benefits
- 85% less energy: vs incandescent bulbs
- 25x longer life: 25,000 vs 1,000 hours
- No heat waste: Cooler operation
- Instant on: No warm-up time
- Dimmable options: Many models available
When to Switch
LEDs are almost always worth switching to immediately due to energy savings, even if your current bulbs still work. The energy savings alone pay for the LED cost within months.
Frequently Asked Questions
How accurate are the results?
The LED Lighting Savings applies a standard formula to your inputs — accuracy depends on how precisely you measure those inputs. For planning and estimation, results are reliable. For high-stakes or professional decisions, cross-check the output with a domain expert or primary source.
What inputs have the biggest effect on the result?
In most financial calculations, the variables with the highest sensitivity are the rate (interest, return, or tax) and time. Try adjusting each by 10-20% to see which one moves the output most — that's where your energy in improving the input estimate is best spent.
Common Tip Percentages
| Service | Typical Tip Range | Notes |
|---|
| Restaurant (sit-down) | 15–20% | 20%+ for exceptional service |
| Food delivery | 10–20% | Consider extra for long distances |
| Taxi / rideshare | 10–20% | More for assistance with luggage |
| Hotel housekeeping | $2–5/night | Leave daily, not just at checkout |
| Barber / hair salon | 15–20% | On pre-discount total |
| Pizza delivery | 10–15% or $3–5 minimum | Higher in bad weather |
General Household Budget Ratios (50/30/20 Rule)
| Category | % of Net Income | Examples |
|---|
| Needs | 50% | Rent, groceries, utilities, insurance |
| Wants | 30% | Dining out, entertainment, hobbies |
| Savings / Debt | 20% | Emergency fund, retirement, extra payments |
Common Measurement Conversions for Everyday Use
| Quantity | US / Imperial | Metric Equivalent |
|---|
| 1 cup | 8 fl oz | 237 mL |
| 1 pint | 16 fl oz | 473 mL |
| 1 quart | 32 fl oz | 946 mL |
| 1 gallon | 128 fl oz | 3.785 L |
| 1 lb | 16 oz | 453.6 g |
| 1 ft | 12 in | 30.48 cm |