cfl wattage

Those 4 bulbs will be enough.
For the part numbers go to light producers website. Or make a search on web. search like "2x55w pll ballast" You'll find many of them.
This is i found for 80w: Philips HF-P 280 TL5/PLL EII 220-240V 50/60Hz 871150006016730
And these are for 55w: Philips HF-P 255 PLL EII 220-240V 50/60Hz 871150006062430. / Osram Quicktronic QTP-DL2X55 EAN: 4008321117960
Only important thing you should look in names is 2 55, 2 80 and pll signs.

Note: This ballasts will run both lamps at the same time. There is no option like one on and one off. You'll be able run 2 or 4 not 3 or 1.

For more, go everywhere in this forum and check this thread.
Answers about CFL, HPS, How Much Light...

Good luck with all :thumbsup:

Quote:

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Originally Posted by tevfik

One thing about his CFL's: Their lumen outputs are based on their position. If you hang it vertically (Which is not possible with that big bulb) then the bulb will give out whats written. But if you hang horizontally then 3 of the 8 U's (about 6-8 tubes) will be looking up to the reflector and large amount of lumen will be lost between reflector and the bulb IMO.

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Surely this would be true for the PL-L bulbs aswell? I am not saying the larger bulbs are better (their bulkiness is a downside to them). But I would think that the PL-L's whilst better overall, might not put out quite as much usable light as you think, as half of the bulb is facing a reflector (Unless you hang them vertically, which is easier to do than with the big 250's).

Quote:

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Originally Posted by PhatJay

Surely this would be true for the PL-L bulbs aswell? I am not saying the larger bulbs are better (their bulkiness is a downside to them). But I would think that the PL-L's whilst better overall, might not put out quite as much usable light as you think, as half of the bulb is facing a reflector (Unless you hang them vertically, which is easier to do than with the big 250's).

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All horizontal hanged bulbs will be facing half of them to the reflector. PLL's have two tubes only, there are no other tubes between them. Light from one tube directly facing to you or to the reflector, not to other tubes. If you have a good shape reflector, you don't loose much. I have two tubes on my bulb and can see them very well. And i can keep all my tubes very close to my plants.
[attachment=o261258]

Now you tell me how many tubes you see from out of 16? How many of them will be close to the plant? 250/16 = 15,6W light per tube. How much watt will reach get directly?
[attachment=o261257]



What about the hole between U's? Where the lights go in there?
[attachment=o261259]

I think you missed my point, nevermind. It wasn't very important. :)
Good luck with your grow.

Sorry about that, probably because of my missing english or you didn't pointed well.

Thanks for the wishes :)