After you have found the light(s) or lamp(s) that you would like to order, enter the desired quantity and click "Add to basket". Your shopping basket will appear with the items you have selected. You can either carry on shopping, update your basket (e.g. the desired quantity) or proceed to checkout.
At the next step you can register as a new customer, so that when you order again in the future, you will not need to enter all your details again, or you can order as a guest. Afterwards you can enter your data, check your order once again, and then submit it.