Q. What is Rav Shlomo’s opinion is regards to the shabbulb use on Shabbos? It is described on their web page as:
The SHABBULB is certified to hide and reveal light with no risk of violating the laws of Shabbat since it does not affect electrical usage. Although LED light isn’t considered “fire” in the Halachik sense, the bulb itself is considered muktseh. The SHABBULB„¢ solves this issue by using a unique removable cover that permits the use of the lever on Shabbat and Yom Tov. It’s important to note that the lamp itself may not be moved or turned on and off during Shabbat and Yom Tov.
Thank you.

A. On question 1599 in regards to the new Shabled light we wrote; “Horav Shlomo Miller’s Shlit’a opinion is in principle to agree to Horav Moshe Heinemann’s Shlit’a certification of the Shabled light use, when left turned on the entire Shabbos and when only the drawer is opened or closed to control the amount of light emitted.
However he disagrees with the New Square Kashrus Council certification that permits moving the unit when permitted utensils such as a watch or jewelry are placed inside the drawer. The reason being, is that the Rov considers the unit to be muktza machmas chisaron kis, since it is an electrical utensil dedicated to giving light that one does not usually use for any other purposes, even when another object is placed on the unit’s drawer. (See similar in Piskei Teshuvos 308: 2: n.9).
Therefore, it cannot be moved even when one needs its place, (lertzorech mekomo), or its use somewhere else (letzorech guffo).
In essence, this new light is not in Halacha much better than the one offered by Kosher Innovations on 2004, that could also not be moved from its place.”
Horav Shlomo Miller’s Shlit’a opinion in regards to the Shabbulb in principle is similar. The Rov disagrees however with Horav Osher Zelig Weiss Shlit’a, and maintains that the bulb itself is muktze machmas chisaron kis.
However, there is an important reason to avoid using the Shabbulb, since unlike the Kosher Innovation lamp, this bulb looks very similar to a common bulb. A casual observer of the closing and opening of the bulb may mistakenly assume that one is turning on and off a regular bulb which is obviously prohibited.

Rabbi A. Bartfeld as revised by Horav Shlomo Miller Shlit’a