how many days does it take for a seed to sprout

[MyMindIsGlowing]

D-Dog,

how close was that 400w?

just wondering, thanks

[digitaldog]

bout 24 inches away!!!! just never had a hps light b4 and really didn`t know how fierce they can be!!! - learnt my lesson now and getting to grips with it all now! i think i put them seeds to germinate a bit too soon!! Should have read more b4 really!! classic case of trying to run b4 i could walk but i`m learning fast now thanks to some class people on here!!! Thanku all!!

[MyMindIsGlowing]

HPS on seedlings. was it a horti?

MH should be used during the Veg stage.

Can anyone tell me if HPS burn hotter than MH and if so, how much hotter giving the same W.

[digitaldog]

i know that now!!!!!! think i was being a bit too keen!!! and yeah i`d like to know if metal halide run as hot or hotter than hps too cos i have my babies under envirolites and other fluoros at the mo but am thinking of getting a MH. heat is a real problem though!!!!

[MyMindIsGlowing]

for 4 plants, a 250MH would be good and good with heat issues. Maybe go with 400MH if you can, I have noticed that "some" floros cause plants to stretch but an MH seems to keep them nice and tight.

Anyone on the heat diffrence? Where is that expert Harddon when you need him

[HARDDON]

Personally I only veg with floros. There is nothing an MH can do that good CFL's cannot do during veg. The MH may be easier to work with than CFLs.

But for lvegging purposes, for me its CFL all they way.

Any light you have, CFL, MH or HPS, when used with a reflector is a heat hazzard. You can mitigate the hazzard with suction, forced fan action, kool tubes, glass, etc...

If you have a small area you are growing in, dont use reflectors.

You would be shocked to learn how many grows are killed because of heat alone.

I too, have been the clown that fried his fields with heat.

For 4 plants, definately go with the 400W over the 250W.

I am sorry but I do not know the temps of MH vs. HPS...although I can assure you that 250W of MH light is 'hotter' than 250W of HPS.

At least thats what my arms, fingers, wrists and head can testify to after all the learning I had to do