Arri daylight fresnel lens lamp appolo hmi bulbs . Available to purchase for immediate download. Below is an extract from the manual converted to text for a quick impression on the content. Arri daylight fresnel lens lamp appolo hmi bulbsDescfipfion and Directions for Use of the ARRI-Daylight Fresnel Lens Lamp APOLLO DAYLlGHT with HMI Bulbs The development of halogen metal incandescent (HMI) bulbs opened a completely new and very interesting field in the manufacture of lighting equipment. Luminous demands, such as high light yield with a spectrum similar to daylight and at reducted energy costs that could not be met by making use of the conventional incandescent lamps, could be realized within a short time. As compared with the former, traditional incandescent bulbs, the HMI bulbs are superior by their essentially better luminous efficiency which is four times as high as that of traditional incandescent bulbs, viz 80 to 100 lm/W as against 20 to 25 lm/W. Particular stress may be also laid on the fact that owing to the increased light efficiency, an extraordinarily low heat radiation takes place. This results in a very advantageous utilization of the ARRI daylight lamp, not least regarding the given savings in time and costs.