Things to know about lighting - Page 25

ganjagoddess · #**241** 07-19-2008, 04:21 PM

Quote:

Originally Posted by powerplant

hi guys i need some help.
can someone check these lights out Osram HQI-BT 400
tell me if they're good for growing. and how many i might need

another question is that. lets say i have 4, 600watt metal halide lamps. will it do the same work as, lets say 1 HPS lamp??

Those specific light bulbs the osram hqi-bt-400 are not good for growing they have a really high Green Output, and plants do not use green light, they use red and blue, look for normal MH or Normal HPS lamps with a high red or blue spectrum....

Also No a MH and HPS bulb are nearly identical in terms of output light, MH light is more Blue, and HPS light is more red.

1 400 watt MH = 1 400 watt HPS roughly in terms of lumens output...

HPS does put out a slight bit more though.

powerplant · #**242** 07-19-2008, 11:37 PM

Quote:

Originally Posted by ganjagoddess

Those specific light bulbs the osram hqi-bt-400 are not good for growing they have a really high Green Output, and plants do not use green light, they use red and blue, look for normal MH or Normal HPS lamps with a high red or blue spectrum....

Also No a MH and HPS bulb are nearly identical in terms of output light, MH light is more Blue, and HPS light is more red.

1 400 watt MH = 1 400 watt HPS roughly in terms of lumens output...

HPS does put out a slight bit more though.

so will i get the same results if i only use MH lamps?

pppfemguy · #**243** 07-20-2008, 12:04 AM

Quote:

Originally Posted by powerplant

so will i get the same results if i only use MH lamps?

nope......you could use hps through an entire grow but NOT mh through an entire grow but the ideal lighting is mh for vegging and hps for flowering u will get the best results with that lighting for your grow

ganjagoddess · #**244** 07-20-2008, 01:18 AM

Quote:

Originally Posted by powerplant

so will i get the same results if i only use MH lamps?

MH light is Blue, HPS light is RED.

Red is better for Flowering, and Blue is better for vegging.

Many do use MH for both, or HPS for Both.

HPS in flower will create denser, fatter buds....

pppfemguy · #**245** 07-20-2008, 03:03 AM

Quote:

Originally Posted by ganjagoddess

MH light is Blue, HPS light is RED.

Red is better for Flowering, and Blue is better for vegging.

Many do use MH for both, or HPS for Both.

HPS in flower will create denser, fatter buds....

really ive never heard of ppl using mh for both vegging and flowering huh news to me

jimbobjim · #**246** 07-20-2008, 03:17 AM

Quote:

Originally Posted by pppfemguy

depends how big ur grow area is dude??

well i posted my lumen's per square feet so it doesn't matter, and in the post above i stated that my grow room is 3 feet by 2 feet. but thanks for the reply.

will this be enough for veg?

Oneton · #**247** 07-20-2008, 03:41 AM

same size as mine bro
iused hps 400w right through with good results,
this time i have a mh as well, lookin forward to see thie results.

Oneton · #**248** 07-20-2008, 03:43 AM

and your floro no not good,
but you can use it to add extra light lower in the room, should help the lower buds a bit

jimbobjim · #**249** 07-20-2008, 03:45 AM

yeah dont really wanna use hps for veg, i dont really think its necessary got an hps for flowering though, gonna built a seperate room for that soon.

jimmyspaz · #**250** 07-20-2008, 07:01 AM

Certainly you can use MH for the entire grow. When I was first setting up my grow room I flowered out a couple of crops under one 400watt MH, I found that, as has already been said,the buds were a little looser and smaller than I now get unde 1000 watts HPS's. If yu can only have one HID lamp in a small area I would go with either a 400 or 600 watt MH. If,in the future you expand,it will be good for your veg room, after all. Good luck!