Instructables
Light up dark areas in your home during daytime using this green and sustainable concept. Recycle used clear plastic soda bottles, add water+bleach, then install. After installation this solar light bulb can provide approximately 55 watts of light from the sun! 

The comments below have noted that this is like a solar tube or deck prism. 

The communities who benefit from this idea live in areas where the houses hardly have windows and live in darkness even during daytime. Their solution up until this innovation was to turn on the light bulb and use electricity.



Source: www.isanglitrongliwanag.org

Materials:
*PET soda bottle
*Galvanized Iron (GI) sheet
*Rubber sealant
*Bleach
*Filtered Water
 
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Step 1: Cut approximately 9 x 10 inches of GI sheet (corrugated or flat)

Picture of Cut approximately 9 x 10 inches of GI sheet (corrugated or flat)
(Filipino: Gumupit ng yero na may sukat na 9 x 10 inches.)


*Here is a how-to video

Step 3: Cut the 1 cm difference radially, making strips and bend upwards, perpendicular to the GI sheet

Picture of Cut the 1 cm difference radially, making strips and bend upwards, perpendicular to the GI sheet
(Filipino: Gupitin paikot ang natira na 1 cm sa maliliit na bahagi at itupi pataas, salungat sa yero.)

Step 4: Using sandpaper, scratch the surface around the upper third portion of the soda bottle where the GI sheet will be placed, to allow the rubber sealant to stick better

Picture of Using sandpaper, scratch the surface around the upper third portion of the soda bottle where the GI sheet will be placed, to allow the rubber sealant to stick better
(Filipino: Gamit ang sandpaper, kuskusin ang ibabaw sa may ikatlong bahagi ng bote kung saan ilalagay ang GI sheet para mas dumikit ang rubber sealant.)

Step 5: Insert the bottle into the GI sheet until the upper third. Apply rubber sealant on the strips above and around the area below. Wait to dry

Picture of Insert the bottle into the GI sheet until the upper third. Apply rubber sealant on the strips above and around the area below. Wait to dry
Picture10.jpg
Picture11.jpg
(Filipino: Ipasok ang bote sa gitnang butas ng yero hanggang sa itaas na ikatlong bahagi. Lagyan ng rubber sealant ang itaas at ibaba ng pinagkabitan.)

Step 6: Fill the soda bottle with filtered water and ~10 mL (2 capfuls) of bleach. Cover with its original cap

Picture of Fill the soda bottle with filtered water and ~10 mL (2 capfuls) of bleach. Cover with its original cap
Picture13.jpg
(Filipino: Punuin ang bote ng filtered na tubig at ~10 mL na bleach (2 sukat gamit ang takip). Ilagay ang takip.)


Step 7: The solar bottle bulb is now ready for installation!

Picture of The solar bottle bulb is now ready for installation!
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(Filipino: Ang solar bottle bulb ay handa nang ikabit!)

(Proceed to next step for the installation.)

Step 8: Cut a hole on the roof, similar to the bottle circumference

Picture of Cut a hole on the roof, similar to the bottle circumference
(Filipino: Gumawa ng butas sa bubong, pareho sa sukat ng bote.)

Step 9: -Place the solar bottle bulb into the hole. Make sure it is firmly in place

Picture of -Place the solar bottle bulb into the hole. Make sure it is firmly in place
InstallationStep3.jpg
(Filipino: Ilagay ang solar bottle bulb sa butas. Siguraduhin na maayos ang pagkalagay.)

Step 10: Drill 4 holes on each side of the solar bottle bulb using Bosch lithium-ion cordless drill and put in the rivets

Picture of Drill 4 holes on each side of the solar bottle bulb using Bosch lithium-ion cordless drill and put in the rivets
(Filipino: Magbutas ng apat sa magkabilang gilid ng solar bottle bulb gamit ang Bosch lithium-ion cordless drill at lagyan ng rivets.)

Step 11: Apply rubber sealant around all edges of the GI sheet of the solar bottle bulb to avoid leakage. Make sure to cover the rivets

Picture of Apply rubber sealant around all edges of the GI sheet of the solar bottle bulb to avoid leakage. Make sure to cover the rivets
(Filipino: Maglagay ng rubber sealant sa lahat na gilid ng GI sheet ng solar bottle bulb upang maiwasan ang pagtulo.)

Step 12: Place a protective plastic tube on the bottle cap and apply rubber sealant

(Filipino: Lagyan ng plastic tube at rubber sealant ang takip ng bote.)
Add some phosphorescent material and you have a night-light as well :D
Petar922 years ago
Why bleach? :)