xtensity

so 4 13 watt bulbs which are each equivlient to 60 watt would be nearly 240 watts of power for my plants??

if yes, are all 13 watts equivilent to 60? Or does it say on the bulb somewhere what it's equivilant to?

Just to get it straight? Because it seems your telling me to use them and everyone else says not to,

Just say yes or no for the above question, because I am really confused and seeing all different mixed answers.

Daddy-O

FORGET EQUIVALENT NUMBERS! THEY DON'T MEAN SHIT!

4 13-watt CFL bulbs will give you 52 watts. That's all there is to it.

sticky_bud

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EMj

http://www.gardenscure.com/420/light...ing-links.html

Do some reading, all the info you are asking about is on this site.

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Incogneato

It has been said, but I'll reiterate... forget about wattage, throw it out the window... wattage is a measure of power consumption and has nothing to do with light emitted.

Lumens is the measure of light emitted... focus on that. There are conversion charts and graphs readily available from manufactures and many bulbs list the lumens on the package.

Find out how many lumens you will need total in your space...divide by number of fixtures. Now you have "needed lumens per socket"...find a conversion chart and that will tell you what wattage cfl you need.

I can tell you that a 30w spiral cfl puts off about 2000 lumens and
23w are about 1800 lumens.

Like EMj said... everything you need to know is here.

xtensity

Alright I understand now, I was just interpretting so much mixed information lol...



Thanks everyone.

Edit:

1 more question while here...

I was looking at the guide on lumens, but I couldn't really figure out how to calculate how many lumens you need exactly...

Like I realize you want 7k lumens per sq foot of room for "killer" bud, but how many lumens does each watt in different lights produce?

How many lumens from 1 watt of CFLs? etc

Like Incogneatto said

2k lumens from 30 watts...? That's like 66.66 lumens per watt

but for the same kind of bulb 23 watt light produces about 78.2 lumens per watt?

How do I figure out how many lumens each light puts off based off wattage if they obviously go off different ratios based off what Incogneato says?

P3nelope

lumen levels are a function of both wattage and, to some extent, Kelvin colour temperature... lumens also vary according to brand

when choosing bulbs i first check Kelvin-- depending whether i want 6500K for vegetative growth or mostly 2700K for flower (with some 6500K)

then i check lumen output, which should be labeled near the colour temp rating and watts...
but if lumen counts are not on the label, i don't consider it a viable brand of bulb and won't buy it...cuz i need that information to do my lux per square foot calculations
i generally ignore wattage.. except i never bother with any bulb less than 23W and prefer 26W cuz the latter are consistently more efficient with more lumens per watt--
basically more is better but otherwise watts are irrelevant and confuzzling cuz the real issue is lumen intensity


P3n

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xtensity

Can I ask the unit for lumens? Where on the bulb do I look at, I see all the labels and such.. but where is the lumen output?

Also.... When the guide for finding lumens required for your room you need to find the square foot... I've seen various ways of finding the sqr foot for a room... some links on google say just multiple length times width, while others say multiple perimeter by height.

Which is it?

P3nelope

area = length x width and calculates in squared feet

if it's not on the label near where it says "####K" or ##W on the packaging, then there is no way to guess lumen output without a light meter... well you could ask the unit if it answers you may need far more help than GC can offer


P3n

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xtensity

No I mean like... would it say XXXX Lumens?

Or is it some random unit? Does height of container not mater when calculating the lumens required?

My box is......

2x1.325x1.375 feet

If I want 7k lumens per square foot I need...... 2*1.325=2.65, 2.65x7000=18550, so I need 18500 lumens......?


3 100 watts bulb would produce about..... 20k lumens? would that work? or?

edit: I can't find any actuall 100 watt cfls on google shopping lol, I found 1.... that's 50 bucks for a single light.