Light bulbs aren't as simple as they once were. We'll help you understand how to pick the right one for your needs.
Each type of light bulb (or lamp, to be technically accurate) has its pros and cons.
Generally, for two light bulbs of the same type, the one that uses more watts will be the brighter. LED light bulbs use less power compared to CFLs, halogens and incandescent lights.
When CFLs first appeared, they usually had an "incandescent equivalent" guide on their packaging, to help consumers choose the right model (e.g. "equivalent to 60W"). But incandescent equivalence is an imprecise measure of light output, and in any case incandescent light bulbs have been largely out of the market for many years, so it won't mean much to many people these days.
Most lamps now state their light output in lumens (lm), which is more accurate and useful, as long as you know what the numbers mean.
All about the technical specs and features of light bulbs, and how light fittings can shorten their lifespan.
LED light bulbs may look pretty expensive, especially if you're old enough to remember buying incandescent globes for less than a dollar each. Are LED light bulbs worth the price? The short answer is yes.
Here's a quick comparison of four light bulbs – LED, CFL, halogen and incandescent – and their costs for one year of use. We assume five hours' use per day and electricity price of 30c/kWh. These bulbs would be roughly equivalent in light output.
- 10W LED: Price $5. Yearly energy use 18.25kWh. Running cost $5.48.
- 12W CFL: Price $6.50. Yearly energy use 21.9kWh. Running cost $6.57.
- 46W Halogen: Price $4. Yearly energy use 83.95kWh. Running cost $25.19.
- 60W Incandescent: Price $1. Yearly energy use 109.5kWh. Running cost $32.85. (Note that these aren't actually currently available in Australia.)
Even with a slightly higher initial price, LED and CFL light bulbs pay for themselves quickly through their much lower running costs.
And remember that halogens and incandescents usually only last a year or two. Claimed life expectancy for CFLs typically ranges from 6000 to 15,000 hours (about three to eight years, assuming five hours' use per day). LED lamps claim 15,000 to 35,000+ hours (about eight to 19 years). Both types do fade over time, CFLs much more so than LEDs.
When we tested light bulbs in the past, the results showed that while a few LED light bulbs didn't last the distance, most did, especially those from major brands. We had several on test for 14,000 hours or more – up to 30,000 hours (equivalent to 16 years' use) in some cases. Read about what we found.
To get the best lifespan from your LED light bulbs, avoid putting them in small enclosed light fittings where the trapped heat will cause them to deteriorate faster.
CFL and halogen light bulbs typically range in price from about $2 to $8. LED light bulbs range in price from about $3 to $20+.