What to watch out for:
Socket: Check for both the type and size of socket to make sure the bulb will fit your lamp.
Dimming: Check if the bulb is dimmable. This will always be clearly stated on the packaging. Standard bulbs are always dimmable.
Light colour: Warm light – 2,700-3,300 Kelvin – is similar to a traditional incandescent bulb. 3,300-4,000 Kelvin is a neutral light, while anything over 4,000 Kelvin is a cooler light. Cooler light, and light that is too white, can create an uncomfortable indoor environment and tends to work less well in the home.
2,500-2,700 Kelvin is great for relaxing. 4,000-4,500 is best for work situations. 6,000 Kelvin and higher can help with Season Affective Disorder (SAD)/winter depression or if you need an energy boost.
Colour reproduction: Light that is too yellow can give unnatural colour reproduction. Light sources are rated on the RA/CRI scale of 0-100, where 100 is natural daylight. For situations where you need good colour reproduction looks for an RA or CRI rating of at least 90. Halogen bulbs are typically rated 99 – they’re the best at colour reproduction but use a bit more energy. LED bulbs typically range from 80-95 – not always the best at colour reproduction but fine for the home as long as you choose a rating over 80.
Energy rating: Chose an A rating or higher, or an LED bulb.