Succulents, by and large, need bright light. But how bright is that exactly?
One of the most common causes of failure to thrive in succulents is lack of light. Trying to grow these plants in the same conditions as a fern is a recipe for disaster.
To give your plants the brightest possible light, place them in a south or east facing window without an over hang or shade.
Not all plants need or like this much light through glass, so move them into it slowly.
Same goes for putting them outdoors for the summer - this is known in horticultural circles as 'hardening off' or acclimating the plants in stages.
Plants are amazingly tough. They put up with an astonishing array of abuse, and continue to try to grow and survive.
If you're paying attention, you'll notice several ways that plants will try to communicate with you in a cry for more light.
Some of them simply elongate, stretching upwards as they try to reach the sun. Others pale out in the center of the new growth.
Even the flower stalks have the ability to try to seek out more light. This Sempervivum is an example of a plant that just won't give up.
More issues with Sempervivum - the poor plant is trying hard to get to a place with brighter light.
A typical response to a lack of light is 'etiolation' where the internodes (the space between the leaves) gets longer, while the size of the leaves stays about the same. You can see it in action in the next photo;
When your plant first shows any of these signs it's time to get it into a brighter situation. If you don't have a sunny enough window, get a grow light.