The gas in the bulbs is under low pressure when cold but very high pressure when hot. In use the bulbs are actually red hot, and potentially dangerous. The bulbs should be allowed to cool for 10 min. Double ended' HMI lamps must only be operated with the bulb in a horizontal position. The 2.5k lamp in particular comes with warnings not to operate it at more than 5 degrees off horizontal.
Soft boxes give a spread of light suitable for background lighting or fill.
Halogen bulbs emit harmful Ultraviolet light, for work in close proximity to the bulbs the safety glass, which also absorbs UV must be used. Either the safety glass or full scrim should always be fitted if people are to be in front of the lights in case the bulb shatters. Fuse rating 2 amp. Bulbs around 10 each. Fuse rating 4 amp.