4 4100k CFL's for veg?


New Member
I have 1 plant in a open room with 4 4100k Cfl bulbs on it, I have 2700k bulbs for flowering, but accidently picked up 4100k instead of 6500k. Will my baby get through veg stage with just these lights, shes about 3-4 inches tall!
Ya can get away with 4100k cfls but they are more yellow/green light spectrum & plants really don't use that spectrum of light a great deal... however they do kick out a small portion of blue / red light tho but not a great deal.

At the end of the day vegitive growth may be a little slower when compared to using 6500k blue spectrum cfls.

If the bulb box is undamaged you may be able to get a refund or change bulbs to suitable light spectrum from the shop you got them from :thumb:
Color temperature is less significant than the amount of light. How many watts? How many lumens?

Color temperature is quite significant. Many phosphor coatings especially those used in the 6400-6500K (daylight) are heavier in the blue end of the spectrum. This helps with leaf growth. (PAR measurements are far more important than watts). This is akin to the old quality vs quantity conundrum. You want more PAR for efficiencies sake than watts. e.g.If you can only get 15%-20% of your light to be PAR from a 600W bulb, you're wasting a tonne of energy. A higher PAR with less watts (IxV=W) drawn is an overall better usage of power.

Wattage is not = PAR output. The two measurements are not related in any way. Wattage is Current in Amps X Voltage. PAR is the measurement of Photosynthetically active radiation (quality of light used for photosynthesis).
this is done in 2 ways.
photosynthetic photon flux (PPF) and yield photon flux (YPF). PPF values all photons from 400 to 700 nm equally, while YPF weights photons in the range from 360 to 760 nm based on plant's photosynthetic response.[6]

PAR as described with PPF does not distinguish between different wavelengths between 400 and 700 nm, and assumes that wavelengths outside this range have zero photosynthetic action. If the exact spectrum of the light is known, the photosynthetic photon flux density (PPFD) values in μmol/s can be modified by applying different weighting factor to different wavelengths. This results in a quantity called the yield photon flux (YPF).[7] The red curve in the graph shows that photons around 610 nm (orange-red) have the highest amount of photosynthesis per photon. However, because short-wavelength photons carry more energy per photon, the maximum amount of photosynthesis per incident unit of energy is at a longer wavelength, around 650 nm (deep red).

Color temperature is quite significant.

Not saying it isn't (or disputing that very impressive equation ;)), but when a new grower's primary concern seems to be spectrum when it isn't clear that they have enough light to be successful, my concern is that they may be focusing on priority two or three stuff when pri one stuff still isn't in place.
True we don't know how many total lumens we're dealing with, but one thing is clear, the quality of the light determines how effective the light output will be for the plants. 4100K is not ideal in terms of PAR.
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