Hi all, 250W and 400W metal halide lamps are readily available (under $200 including ballast and luminaire) for use as floodlights, and they have a colour temperature of about 4000K. Has anyone tried using them as a homemade projector lightsource? Or know if the large ones designed for floodlight use are suitable for projection? Their spectrum is not quite continuous but according to wikipedia, bulbs using this technology are commonly used in projectors, though I don't know if the halide mix is the same. Do I need to look for something specific like a HMI lamp? I've just ordered two 250W units (each with similar lumen output as about 1.2kW of tungsten light) for use as floodlights and think I might have to try one as a projector bulb. While I'm sure they'll look nicely white as floodlights, I'm just concerned that the spikes in the spectrum won't necessarily play nicely with the dyes in E-6 chromes and that some colours may look artificially bright or dim depending on how the source and dye spectra align.