Cold Lights - or " the Lavendel Cold Light Trilogy "




About: Hi, i am a Steampunk Artist from Germany. You have Questions? Write me, check out my Homepage or meet me at Facebook.I look forward to your entries :)


just another Project of me. Cold lights or " The Lavendel Cold light Trilogy " . Here I have created three different cold lights with different Colours. Anyone can recreate these lights with a vew Things.

We need:

Some various, Brass Lamp parts

3 pc 300 Watt light bulbs ( larger, smaler, just like you want. Glass bottles or similar )

Fluorescent Powder Like this one

3 pc Test Tubes and Cork Like this one

6 pc UV-Leds and Resistor for 9V

3 pc 9V Battery

3 pc On / Off Switches


Different Acid and Sulfur Liver for Coloring

Thin Cables

Distilled Water


Step 1: The Stand or Housing

First we have to empty the bulbs. It give a lot of instructions here how to empty a lightbulb.

Be careful because the glass can break very quickly. In the second picture you can already see the shelter with the empty bulbs. Now even dye the thread . ( Pic 3 )

Glue an Uv Led in the Stand, directli under the Glas from the Bulb. Also we solder parallel a second Led to the Textilcabel. Make it long enough and you can cut later.

Step 2: Glasholder

Make 3 Glassholders for the Lightbulbs like your Fantasy. I made Spirals.

Cut the Test Tube to a lenght of ~ 10 cm. Dremel and Proxxon help you ;)

Drill a Hole in the Cork for the second UV-Led. ( Pic 2 ) and glue it with Hotglue. At the same time we still manufactures a cap for the test tubes like in the second Picture.

Now we put a on/off Switch in every Device and wire them to the Led´s ( Pic 3 )

Step 3: The Filling

OK, now we experiment in our laboratory.^^

It makes a lot of fun to mix the color.

In these Step--> Use gloves and wear protective eyewear !!!!!

What we have?

Rhodamine B500 !!!!!! Rhodamine B is classified as hazardous under REACH/CLP legislation: Danger

Rhodamine 6G




Acridine Orange

Green Fluorescent Dye

Acridine orange, Bromofluorescein, Fluorescein and Fluorescent green are not classified as hazardous under REACH/CLP legislation


Optical Brightener

Optical Brightener is classified as hazardous under REACH/CLP legislation: Warning


Fill the Test tubes with destilled Water. The Bulbs also.

Please only very , use very small amounts of the Fluorescent Dyes. Rhodamine immediately stained hands.

The imaging is really hard to leave. ( omg, i think on my red Fingers...........°!° )

Step 4: Interim Result

Even without UV-Light :)

Step 5: OK..........

with UV-Light !!!

It creates a beautiful light . Especially in the evenings , it makes for great Ambient.

Coldlights-or " The Lavendel Coldlight Trilogy "

In Hope you have Fun with this !!!

Your leander Lavendel

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    52 Discussions

    Darn, now I want one. Very well done, I especially like the green one.


    3 years ago

    might have to find an old lantern to rework for this


    3 years ago

    So clever! Will have to try and make this one.


    3 years ago

    Hi, really good looking stuff, thanks. A question: won't those UV LEDs harm the eyes? The other question was about dyes that won't make you grow a tail, but I can see some suggestions already.

    8 replies

    Reply 3 years ago

    actually the uv wavelength is being converted to another non-harmful visible wavelength by secondary emission of the uv primary exciter wavelength. if done correctly, there should be very little or no uv being emitted from the spectroscopic action.


    Reply 3 years ago

    I'm afraid you lost me, I have no clue what the secondary emission of the uv primary exciter is. Are you saying that the UV LEDs do not emit UV light? Or is it that the particular assembly kindly proposed by Leander converts the UVs into a different wavelength?


    Reply 3 years ago

    simply put: the fluorescent material, converts the uv light into a different light. so the uv light is used up, in the conversion process. and any leftover uv, that did not get converted, would be well below any harmful threshold.


    Wait so a UV led or blacklight fluorescent bulb can harm the eyes? I didn't know that. There's a Mexican restaurant near me that has UV LEDs on the outside of their building.


    well this, depends on the flux density of the uv lights and the distance. i seriously doubt that they are as bright, as the uv light from the sun in the daytime at a distance.

    as you do not want to walk up too close, and stare into them for a prolonged length of time. as with all radiation, time, distance, viewing angle and shielding are always the important factors where the eye is concerned.

    light radiation is inversely proportional, to the square of the distance. at one meter from the point source, will only receive 1/4 of the flux density. so at two meters, you only, receive about 1/4 of the flux density at one meter looking directly at it.

    even the visible colors, of the light spectrum can be harmful if it is intense enough to the human eye. can result in temporary or permanent, blindness.

    lasers are of particular concern in this area. that can result in temporary or permanent, blindness. much more damaging, than any of the common leds to stare directly into. collimated light, does not diminish as easily as point sources with distance.

    the problem with uv is you, cannot see the entire brightness of it. and can only indirectly observe the difference in brightness with a fluorescent material. unlike infra-red where you cannot see the full brightness, but can feel the heat from it.

    currently 1watt, is about the maximum for a single led used for lighting. but most other common use leds, are far less powerful than this.


    I need to brush up on my physics, but that makes sense. So they're not the same intensity of radiation as a welding arc, but you should still not stare at them up close. Thank you for the wealth of information!


    that is, exactly it.

    fluorescent bulbs, most likely emit far more uv than a single uv led. but the fluorescent coating, on the inside of the bulb converts this to the white visible light spectrum.

    1 watt per square meter for a led, is far cry from the 30 to 50 watts per square meter uv being produced in a fluorescent bulb. without the fluorescent coating, is like a suntan booth.

    welding can produce, well above this to several hundred watts per square meter. depending upon, the amperage setting of the welder. the reason for long sleeve shirts, and welding helmets.

    the sun, is typically 35 to 40 watts average per square meter. and on cloudy days, the uv at about 7 to 8 watts per square meter, can cause a severe sun burn in about an hour or less. going unnoticed unfelt, until after the crispy critter damage is done.

    Leander Lavendelpsargaco

    Reply 3 years ago

    Hi psargaco,

    It is like any other led also . You should not look directly into it .On the other side are the led´s built in the housing and directly under the Bulb so that you can not see into it. the colors are all harmless. except rhodamine group!! However, it must be remembered that really only smallest quantities are used . greater volumes weaken the luminosity. If you use the rhodamine with caution ---> use- gloves and eye protection , then I think that is ok. You need not necessarily use the rhodamine . Mix the other colors and you'll get great results. :)


    3 years ago

    Love your work, I have used antifreeze for similar uses, tonic water has a soft glow too.
    Clear gelatin will hold colored liquids in a stable state too.

    4 replies
    Leander Lavendellongwinters

    Reply 3 years ago

    THX ;)

    Yes i know. Also going-> Washing Powder and Chinin ( so you say in Tonic Water and Bitter Lemon), Woodchips from Acacia, some Stones like Fluoride and and ....

    but not everything, will fluoresce the same color as the material. not sure but i, think they use anthracine as one of the powders in fluorescent bulbs. and even the blue sky in the day, is the result of fluorescence from mostly gamma rays from the sun being converted to scattered blue light.

    and types a, b, or c uv wavelengths fluoresce different things. but the b and c, need more careful consideration. since they, are a more penetrating and damaging energy wavelength. but the uv leds commercially available are type a wavelength around 492 nanometers.

    Oh , here a lot has happened since yesterday. :-)

    @ jimmie.c.boswell

    Yes that's true. Fluorescein is a red powder and dissolved in water , it is green. Rhodamine is shimmering green and in Water its red. You need to get a couple of times to try to achieve the desired color. You need for only a few granules . 3-4 pc like grain of sand. Too much of the color makes the mixture become too dark and the uv activity decreases.

    yes but with the highlighters, the pigment color with the uv dye glows the same color. and yes oversaturation, should be avoided.