Direction of bulb

Hi All,

I've a 1.25 x .75 metre grow going under a 600W HPS. The bulb is mounted horizontally under a dutch barn type reflector.

I hung the lamp centrally in line with the longest side. Now I'm wondering does more light get emitted from the sides of this setup and perhaps I should consider hanging the lamp at right angles to the longest side.

I'd appreciate anybodys thoughts on this - facts and figures would be even better.

Thanks

Jack

I'm having a hard time visualizing what your saying, I have a 400wMH horizontally under a reflector too. Mine is completely horizontal and all the light comes down.
Get some pics on here if you can.

I too am not sure what you are asking but a point to remember is that a 600 watt system will cover approx a 4X4 - 4X5 area.

WWW

I've attached a quick sketch - it might explain a little better

Jack

I'd go with option "B" myself.

is it a batwing reflector? if the short sides aren't closed off, hang like pic b.

The length is 1.25 metres and the width is .75 metres.

I suspect that if there is any difference in the 2 setups it may be only a couple of percent but hey every % helps

Jack Angel

Its a Dutch barn reflector - open ended

power from bulb is in circle shape. thats what the reflector is designed to maintain. like this

so try and get everything in the circle. but if you cant, put them on the closed sides.

Hi,

I use the same reflector with a 400,
I use B set up and my room is 90x70

90Cm seems to be the limit.
I think 125 is pushing it even with a 600.

It's a SCROG grow so the complete area is full of bud. I hadn't really thought about what way to hang the bulb so I hung it as in pic A simply because it looked neater, but now having ruminated over a couple of spliffs on the matter I'm tempted to hang it as in pic B

It'd be interesting to know if someone had a light meter and knew if there was any discernable difference between the 2 ways of hanging the bulb

you're right about 125 being the limit - the buds at the very end are looser than the others, but a loose bud being better than no bud I'm happy to have it hanging on there.

I think I will swap over to B

Jack