Lancework is always created on a frame and as such is a ground-effect firework. Lettering is usually about 30cm high. For best results it needs to be mounted as high as possible on wooden posts. Note that it is not possible in consumer fireworks to create lettering that goes off in the air.
Pre-made lancework such as BYE retails for around £75 with Good Night costing around £150. Custom words typically cost around £25 per letter although delivery can sometimes be expensive (partly due to the requirement of using an explosives courier and partly because of the incredibly big boxes needed to pack this in). Not every firework specialist is able to make lancework and with many it is an item for collection only. It can also be time consuming to build so enquire and order early.
An alternative to lancework, particularly for much bigger or more complex designs, is fire rope. This is, as the name suggests, a type of rope that burns slowly and is twisted into the required shape, also on a wooden frame. However, this effect tends only to be used in professional shows and is not on sale to the consumer (if you know any different please let us know).