You can, but it's not a great idea. Halogen lights, as with incandescent lights, use lots of electricity, and most of this generates heat rather than light.
I would suggest using fluorescent, HID or LEDs for grow lighting.
iodine
Wikpedia says that halogen lamps produce about 19-20 lumens/watt. If you have a 500W lamp then you get 9500-10000 lumens.
Halogen light bulbs are used because:they can be operated at a higher temperature than can be used for ordinary light bulbs. This results in less heat production compared to light output and an overall much higher efficiency in the conversion of the energy which is input - electrical energy - to the energy which is output as visible light.andthey have a significantly longer useful life than ordinary incandescent light bulbs.Technical noteThe invention of halogen lamps was based on the discovery of a special physical feature: when small amounts of a halogen gas were added to the contents of the light bulb, these were found to help to return large quantities of evaporated tungsten atoms back to the filament. This resulted in a significantly longer lifetime of such lamps.General note about how all incandescent filament light bulbs operateAn electrical current travelling through the filament of a light bulb makes it glow white-hot and generate both light and heat because of the electrical resistance of the filament.The filament is normally mounted within a special mixture of noble and/or inert gases held inside the glass enclosure of the light bulb, held at a pressure which is close to a vacuum.The special mixture of gases prevents the filament from oxidizing and burning away, which would happen extremely quickly if it glowed white-hot in normal air which contains oxygen.
maybe iodine.
Quite a bit, actually. The dense halogen gas that fills the envelope (glass bulb) of the halogen lamp allows the filament to transfer heat more rapidly than other gasses. The glass is a borosilicate glass that has a low coefficient of expansion and is typically very small in comparison to non-halogen bulbs of the same wattage. The manufacturer will warn you to not touch the envelope with your fingers because the glass gets so hot that it will convert the grease from your fingers into carbon marks that will absorb heat and cause the glass to melt and blow out.
Halogen gas is in a Tungsten-Halogen Light Bulb.
I would check with my local law enforcement department. They have vast knowledge of the best methods to grow marijuana.
an electric current passed through it
Yes, dimming a halogen light can reduce electricity consumption because less power is needed to produce the lower light output. By lowering the brightness of the 3 halogen bulbs in your bathroom light, you can save energy and reduce electricity costs.
"The deer froze, blinded by the halogen headlights on the truck headed straight towards it."
Either Xenon or Halogen, depending on which type of light you are referring to.
halogen headlamps in his '68 Camaro
Halogen light bulbs are more energy-efficient and have a longer lifespan compared to incandescent light bulbs. Halogen bulbs use less energy to produce the same amount of light as incandescent bulbs, and they also last longer before needing to be replaced.
Halogen lights are safe for indoor use but it is required that they be in a glass shield. They omit more UV rays then your standard light bulb so you need to be protected.
A halogen light emits more heat than an incandecent light.
Halogen is a gas, so your question doesn't make much sense. If you're asking about a halogen (light) bulb, then the answer is: mainly halogen.
Halogen light glows and LED is dull.