HPS VS MH Heat wise?

Do they put out the same amount of heat when comparing the same amount of watts?

https://www.rollitup.org/indoor-growing/22790-heat-output-mh-vs-hps.html

MH.

MH is hotter or cooler?

Hps. .

You are making no sense at all. This thread is to determine which one puts out more heat. Just say which one puts out more heat. Or which one is cooler. Just putting MH or HPS doesn't help me

Hotter. .

which one is hotter? lol You must be baked and enjoying this

Cooler. .

Your too smart for your own good

use digital ballasts not magnetic for either and heat really wont be a problem with proper air intake and exhaust

HPS has a ~1100C arc.

MH has a ~1090C arc.

Not sure if this will help you or not but "Day light" MH lamps operate at around 5500K and HPS lamps at around 2200K. MH is typically used during the vegetative stage of the plants life cycle and HPS during the flowering cycle. Is heat an issue because of the area your growing in? I have a pretty small area to grow myself (9' x 3') and I am using a 400W HPS lamp which is putting off a decent amount of heat. My plants however are kept at around 77F to 80F without any issues because of good ventelation.

i keep my ballasts out of my grow area and i was thinking of water cooling. still need an answer. . . .

Product description and operating information
Short arc metal-halide lamps are lamps for dc and ac operation in which the discharge arc burns at high pressure
in an atmosphere of halogen and mercury vapor. Short arc metal-halide lamps are available in wattages from 10
W to 18000 W.
When the lamps are in a cold state, in other words at room temperature (21°C), the mercury is generally present
in the form of small metallic droplets in the discharge vessel. When the lamp is started, the mercury vaporizes
as the temperature in the bulb rises and heats up in the arc between the electrodes to around 10,000°C. The
temperature on the inside wall of the bulb is around 800°C. When thermal equilibrium is reached (which may
take from 1 to 10 minutes after the lamp has been switched on, depending on the type of lamp), the mercury
vapour exerts a pressure of up to 200 bar on the bulb, depending on the type of lamp.

It depends who makes the bulb! It depends on your ballast to a lesser extent. It also varies by wattage.

If you want to compare really good bulbs: http://www.eyehortilux.com/techbulletins.html provides this information.

MH 1000W:
Maximum base temperature 210 (410) °C (°F)
Maximum bulb temperature 400 (752) °C (°F)

Their HPS 1000W is identical.

The answer is they're too close to the same to select one based on heat. Select a light based on need as in flower vs veg. If you want one light to do both as well as possible, which does happen to run cooler (not that it matters), buy a pulse start halide fixture.

All lights create heat. When you're in this range of watts you just deal with it or you don't go this big.

I was thinking of going all blue halide for veg and all red hps for flower. The dude at the local garden shop was trying to talk me into getting a warm spectrum halide instead of a hps? Why?

Maybe because HPS spectrum sucks donkey #$@!.

Ask him... duh?

He said because the halide puts out more blue, so it helps veg growth. But why should I care about veg growth when I'm flowering?